Direct answer
For the Apple iPhone 11, carrier service, selected line, account activation, recipient-specific block and messaging service should be separated. First, test a normal call, SMS and another contact with Wi-Fi off.
What this covers
- Apple iPhone 11 (A2111/A2221/A2223)
- Apple iPhone family; connector, modem, camera, biometric and iOS eligibility vary by exact model.
- The specific fault this record addresses: cannot make calls or send messages
What it does not cover
- ×The same symptom on a different Apple product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
No usable service in the first place
What separates it No calls and no SMS, with the status bar showing no service or emergency only. Everything else on this page assumes service exists.
How to confirm Check the signal indicator and whether data works. Where there is no service at all, that is the problem to solve first.
- 2
The account is suspended or the line was ported
What separates it Emergency calls only on a phone that is otherwise perfect, often on a billing date. It looks identical to a hardware fault.
How to confirm Check the account status with the carrier before anything phone-side.
- 3
The number is blocked, or the phone is silencing unknown callers
What separates it Specific people cannot reach you, or calls go straight to voicemail without ringing. Both platforms offer silencing of unknown numbers, and block lists accumulate.
How to confirm Check the block list and any silence-unknown-callers setting. This produces a phone that appears to work perfectly and misses specific people.
- 4
Call forwarding was left on
What separates it Calls never arrive and go somewhere else entirely, often after a trip abroad or a voicemail setup. Forwarding survives until it is switched off.
How to confirm Check the call forwarding setting, which is easy to leave enabled and gives no indication that it is.
- 5
A focus mode silencing calls
What separates it Calls arrive but the phone does not ring, on a schedule. Focus and bedtime modes both do this deliberately.
How to confirm Check for an active focus mode and its allowed-callers list.
- 6
Wi-Fi calling on a poor Wi-Fi network
What separates it Calls fail or break up at home where cellular is fine, or the reverse. Wi-Fi calling prefers Wi-Fi even when the Wi-Fi is worse than the cellular signal.
How to confirm Turn Wi-Fi off and retry the same call. A clear difference identifies the path.
- 7
RCS or an internet messaging service rather than SMS
What separates it Messages fail to one person and work to everyone else, or fail on Wi-Fi and work on cellular. Modern messaging silently chooses between several transports.
How to confirm Send the same message as a plain SMS where the app allows it. Success there localises the fault to the internet transport rather than the network.
- 8
The recipient's number is stored in the wrong format
What separates it Messages fail to contacts saved without a country code, particularly after travelling or changing country.
How to confirm Compare a failing contact's stored number against the full international format.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether calls fail, messages fail, or both — and whether it is to everyone or to specific people.
- The signal indicator and whether mobile data works, which establishes whether there is service at all.
- Whether it fails on Wi-Fi, on cellular, or both.
- Whether calls ring and are missed, or never arrive at all — those are different failures.
- Whether call forwarding, a block list, or a silence-unknown-callers setting is active.
- Whether the affected contacts are stored in full international format.
- The account status with the carrier.
Establish whether there is service at all
ReversibleNo service, or emergency calls only, makes everything else on this page irrelevant. 'Emergency calls only' in particular usually means the phone found a network and was refused by it, which is an account matter rather than a phone one.
Determine whether it is everyone or specific people
ReversibleEveryone points at service, the account or a system setting. Specific people points at a block list, a contact's stored number format, or the messaging transport. These share no further steps.
Check the block list and silence-unknown-callers
ReversibleBoth produce a phone that appears to work perfectly while specific people cannot reach you, and both accumulate quietly. Calls going straight to voicemail without ringing is the classic signature.
Check call forwarding
ReversibleForwarding left on after a trip abroad or a voicemail setup sends calls somewhere else indefinitely, with no indication on the phone that it is doing so. This is a five-second check that resolves an otherwise baffling symptom.
Turn Wi-Fi off and retry the same call
ReversibleWi-Fi calling prefers Wi-Fi even when the Wi-Fi is worse than the cellular signal available. Calls that fail at home and work elsewhere, or the reverse, are identified by this single test.
Send the same message as a plain SMS
ReversibleModern messaging chooses silently between RCS, an internet service and SMS. Success as plain SMS localises the fault to the internet transport, which is a completely different investigation from the cellular network.
Check the contact's stored number format
ReversibleA number saved without a country code fails in ways that look like a network fault, particularly after travelling or changing country. Comparing a failing contact against the full international format is quick and specific.
Check for an active focus mode
ReversibleCalls that arrive without the phone ringing, on a schedule, are a focus or bedtime mode with an allowed-callers list — not a call failure. The distinction matters because nothing about the network is involved.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- A2111/A2221/A2223. Apple iPhone family; connector, modem, camera, biometric and iOS eligibility vary by exact model.
- Display
- 6.1-inch all-screen LCD with IPS technology, 1792-by-828 at 326 ppi. Control positions, reachability and how much fits on screen all change with size, so a procedure written for another model in this line will not map one-to-one onto this one.
- Chip
- A13 Bionic. The chip generation governs how long this model keeps receiving iOS updates, and it is the underlying reason an app can stop working here while running normally on a newer iPhone — a support-window matter rather than a fault.
- Connector
- Lightning. Lightning cables and adapters are not interchangeable with the USB-C iPhones and a USB-C cable will not fit at all. Lightning cables also fail internally at the strain point near either connector, which is why a cable swap is the first test for slow or intermittent charging.
- Biometric
- Face ID — face recognition, not a fingerprint reader. It refuses whenever it is not confident, so darkness, strong backlight, unusual angles and lying down all reduce it, and a case lip or a screen protector over the sensor area disables it outright.
- Camera
- 12MP Wide and Ultra Wide. A 12-megapixel main sensor produces much smaller files than the 48-megapixel iPhones, so a storage complaint on this model is less likely to be photos than it would be on a newer one.
- Storage options
- Sold in 64GB/128GB/256GB. The 64GB entry tier is the single most common cause of storage trouble on this model — a current iOS install plus a photo library leaves very little margin, and an update needs room to unpack and stage as well as to store, so it can refuse with what looks like adequate free space.
- Wi-Fi
- Wi-Fi 6 with 2x2 MIMO. This matters directly to Wi-Fi troubleshooting on this model: the generation determines which bands and features it can use, and a router running a newer standard will fall back rather than refusing — so a phone underperforming a newer sibling on the same network is often specification rather than fault.
- Bluetooth
- Bluetooth 5.0. Version differences affect range, reconnection behaviour and which accessory features are available — a newer accessory paired to an older Bluetooth version simply operates at the older one's capabilities rather than failing, which is often mistaken for a pairing fault.
- Screen brightness
- 625 nits maximum brightness (typical). Brightness is one of the largest single consumers of battery on any phone, so a model rated at a higher figure will spend more when it is actually driven to that level — and outdoor readability complaints are usually this specification rather than a display fault.
- Water resistance
- Rated IP68 — Apple specifies a maximum depth of 6 metres for up to 30 minutes under IEC standard 60529. That is a laboratory figure for a new device in fresh water; it degrades with age, drops and seal disturbance, and Apple does not warrant liquid damage.
- SIM
- Supports eSIM alongside a physical nano-SIM. An eSIM does not travel with the handset the way a plastic SIM does — a phone swap, a reset or a repair can leave the profile behind, and restoring it is a carrier action rather than a phone setting.
- Wireless charging
- No MagSafe magnet array on this model. Where wireless charging is supported it relies on alignment alone, which makes placement fussier than on the MagSafe iPhones and makes a thick case far more likely to defeat it.
- Battery rating
- Apple rates this model at up to 17 hours of video playback. Compare your own runtime against that figure and against your own history — the rating varies widely across this line and a smaller iPhone is not faulty for lasting less than a Max.
- Video recording
- 4K video recording at 24, 25, 30 or 60 fps. Frame rate and resolution are the dominant factor in how quickly video fills storage, and they are also what pushes the phone hardest thermally — sustained high-frame-rate recording is the most common cause of a camera that stops mid-take.
- Weight
- 6.84 ounces (194 grams). Worth knowing where a mount is involved: the heavier models in this line stress adhesive mounts and magnetic car holders considerably more than the lighter ones.
- Panel type
- An LCD panel rather than OLED. Dark mode saves no meaningful power here — the backlight illuminates the whole panel regardless of content — and the per-pixel dimming and true blacks described for OLED iPhones do not apply.
- Apple's own specification
- Apple publishes the full technical specification for this model at support.apple.com/en-us/111865. Where any figure above matters to a decision, that page is the authority and this one is not.
- Charging
- Supports wireless charging. Coil alignment is tighter than it looks and a thick case, a metal plate or a card in the case defeats it entirely — so wireless charging failing while cable charging works is usually the case rather than the phone.
- Platform
- iOS. Settings paths, permission models and background-execution rules differ substantially from Android, so a procedure written for an Android phone will not map onto this one screen for screen.
- Panel
- An LCD panel rather than OLED. Dark mode saves no meaningful power here — the backlight illuminates the whole panel regardless of what is displayed — and the per-pixel dimming, true blacks and always-on behaviour described for OLED models do not apply.
- Storage headroom
- Sold with a small entry tier by current standards. This is the single most common cause of storage trouble on this model: a modern OS install and a photo library leave very little margin, and an update needs room to unpack and stage as well as to store, so it can refuse with what looks like adequate free space.
- Symptom boundary
- This record covers Apple iPhone 11 when it cannot make calls or send messages. A different symptom on the same hardware, or this symptom on a different Apple product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !The account is suspended or the line has been ported away — a carrier matter that no phone-side change addresses.
- !There is no service at all and another phone on the same carrier works in the same place.
- !Calls connect and neither party can hear the other after the microphone and speaker have both been excluded.
- !Emergency calling itself is unreliable, which should be treated as urgent rather than troubleshooted at leisure.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Apple Support publishes this as "If your call fails or you can't receive calls on your iPhone". Apple's call-failure article. Probed 2026-08-23: title-verified. What that article does not carry is the model boundary — it is written for a product line, and A2111/A2221/A2223 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
What size is the iPhone 11 screen?+
6.1-inch all-screen LCD with IPS technology, at 1792-by-828 at 326 ppi. That matters more than it sounds — a procedure written for a different size in the same line puts controls in different places, and gestures that depend on reach behave differently.
Does the iPhone 11 use USB-C or Lightning?+
Lightning. A USB-C cable will not fit at all, which is the usual explanation when a charger that works on a newer iPhone in the same household does nothing here. Lightning cables also fail internally at the strain point, so a cable swap is the first test for slow or intermittent charging.
Does the iPhone 11 have Face ID or Touch ID?+
Face ID. It is deliberately quick to refuse when not confident, which is why darkness, strong backlight, unusual angles and lying down all reduce it — and why a case lip or a screen protector over the sensor area disables it entirely.
What chip does the iPhone 11 have?+
The A13 Bionic. This determines how long the model keeps getting iOS updates, and it is the reason an app can drop support for this iPhone while running fine on a newer one — a support-window matter rather than a fault to troubleshoot.
How much storage does the iPhone 11 come with?+
64GB/128GB/256GB. The 64GB tier is the single most common cause of storage trouble on this model, and it is why an update can refuse with what looks like enough space free — installation needs room to unpack and stage as well as to store.
Is the iPhone 11 waterproof?+
No — water resistant, rated IP68, which Apple specifies as a maximum depth of 6 metres for up to 30 minutes under IEC standard 60529. That is a laboratory figure for a new device in fresh water; it degrades with age, drops and seal disturbance, and liquid damage is not warranted.
Does the iPhone 11 support eSIM?+
Yes, alongside a physical nano-SIM. Bear in mind that an eSIM does not move with the handset the way a plastic SIM does — a phone swap, a reset or a repair can leave the profile behind, and restoring it is a carrier action.
What Wi-Fi standard does the iPhone 11 support?+
Wi-Fi 6 with 2x2 MIMO. That is worth knowing before blaming the phone for slower Wi-Fi than a newer device on the same network — a router running a newer standard falls back to what the phone supports rather than refusing it, so the difference is specification rather than fault.
What Bluetooth version does the iPhone 11 have?+
Bluetooth 5.0. Version affects range, reconnection behaviour and which accessory features are available. A newer accessory paired here operates at this version's capabilities rather than failing, which is regularly mistaken for a pairing fault when the accessory simply cannot do everything it does on a newer phone.
How bright is the iPhone 11 screen?+
625 nits maximum brightness (typical). Brightness is among the largest single consumers of battery, so outdoor use at full brightness costs real runtime — and poor outdoor readability on this model is usually this figure rather than a display fault.
How long should the iPhone 11 battery last?+
Apple rates it at up to 17 hours of video playback. Judge your runtime against that figure and your own history rather than against a different iPhone — the rating varies widely across this line.
What video can the iPhone 11 record?+
4K video recording at 24, 25, 30 or 60 fps. Resolution and frame rate are the dominant factor in how fast video fills storage, and they push the phone hardest thermally — sustained high-frame-rate recording is the most common reason a camera stops mid-take.
Does dark mode save battery on the iPhone 11?+
Not meaningfully. This model uses an LCD panel, which backlights the whole screen regardless of what is displayed. Dark mode only saves real power on the OLED iPhones, where black pixels are switched off entirely.
Calls go straight to voicemail without ringing.+
Check three things: call forwarding, the block list, and any silence-unknown-callers setting. All three produce exactly this, all three leave the phone looking perfectly healthy, and all three are easy to leave switched on without knowing.
Only one person cannot reach me.+
That rules out service, the account and the phone — all of which would affect everyone. What remains is a block list entry, that contact's stored number format, or the messaging transport being used for them specifically.
Messages fail to one contact and work to everyone else.+
Send the same message as a plain SMS if the app allows it. Modern messaging silently chooses between RCS, an internet service and SMS, and success as plain SMS localises the fault to the internet transport rather than the network. Also check that their number is stored in full international format.
Calls break up at home but are fine elsewhere.+
Turn Wi-Fi off and retry. Wi-Fi calling prefers Wi-Fi even when the Wi-Fi is worse than the cellular signal available, so a poor home network can produce worse calls than no Wi-Fi at all. One test identifies it.
My phone says emergency calls only.+
That usually means the phone found a network and was refused by it, which points at the account or the SIM rather than the radio. Check the account status with the carrier first — a suspended line and a failed radio look identical from the status bar.
Calls arrive but the phone does not ring.+
Check for an active focus mode and its allowed-callers list. Focus and bedtime modes silence calls deliberately and on a schedule, and nothing about the network or the call itself is involved.
I cannot call anyone after coming back from abroad.+
Check call forwarding first — it is commonly enabled while travelling and left on afterwards, and the phone gives no indication. Then check that the network selection has been returned to automatic rather than left on a manual foreign network.
Messages send on Wi-Fi but not on cellular.+
That points at the internet messaging transport rather than SMS. The two use completely different paths, and a transport that works on one connection and not the other is describing the network rather than the phone or the recipient.
Calls connect but nobody can hear me.+
That is a microphone problem rather than a calling one — and the first thing to check is whether a Bluetooth accessory is connected somewhere, because it takes the call's microphone with it. Record a voice note to test the microphone alone.
Does this answer apply to every Apple model?+
No. It is scoped to A2111/A2221/A2223. Apple iPhone family; connector, modem, camera, biometric and iOS eligibility vary by exact model.
What should I record before troubleshooting calls or messages?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing calls, messages. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Use another reliable path for urgent or emergency communication.
Answer for the exact device and software version shown above.