Direct answer
For the OnePlus Nord N30 5G, carrier outage/account/provisioning, SIM/eSIM, coverage, line selection and device radio should be separated. First, test calls and data in two locations with Wi-Fi off.
What this covers
- OnePlus Nord N30 5G (CPH2513 and regional variants)
- OnePlus phone; OxygenOS version, region, alert slider/key, charging protocol and carrier certification vary.
- The specific fault this record addresses: has no cellular service or data
What it does not cover
- ×The same symptom on a different OnePlus 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
Coverage where you are, not the phone
What separates it Service is fine elsewhere and poor at one address, or degraded since a mast change. Indoor coverage in particular varies enormously with construction — foil-backed insulation and low-emissivity glazing both attenuate heavily.
How to confirm Compare with another phone on the same network in the same place. Same network struggling on both is coverage; one phone struggling is not.
- 2
The account is suspended, or the line was ported away
What separates it Emergency calls only, on a phone that is otherwise perfect, often on a billing date. The phone reports this identically to a hardware fault.
How to confirm Check the account status with the carrier before doing anything to the phone. This is the cheapest possible check and it is skipped constantly.
- 3
Carrier settings or an APN that is out of date
What separates it Calls work and data does not, or the reverse, after a network change or a phone migration. The APN and carrier profile define how the phone talks to the network.
How to confirm Check for a carrier settings update, and compare the APN against the carrier's published values rather than editing it speculatively.
- 4
The phone is locked to another carrier
What separates it A new SIM produces no service on a phone that worked with its original one. Second-hand and carrier-financed handsets are the usual case.
How to confirm Check the phone's own carrier-lock status in settings. No configuration works around a locked handset.
- 5
Band or network-mode selection excluding the available service
What separates it Service is poor in a place where the carrier claims coverage, or after travelling. A phone pinned to 5G-only or to a manual network selection can exclude what is actually available.
How to confirm Set network selection back to automatic and the preferred network back to its default. Manual selections outlive the reason they were made.
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.
- The exact indicator: no service, searching, emergency calls only, or service with no data. These are four different failures with four different causes.
- Whether it fails everywhere or only at particular locations.
- Whether another phone on the same carrier has the same problem in the same place.
- What changed and when: a new SIM, a phone swap, a reset, a repair, a plan change, travel, a billing date.
- Whether calls work while data does not, or vice versa — that split points at carrier settings rather than at the radio.
- The account's status with the carrier, checked before any phone-side work.
Read the exact indicator before doing anything
ReversibleNo service, searching, emergency calls only, and service without data are four different failures. 'Emergency calls only' in particular usually means the phone has found a network and been refused by it — which is an account matter, not a radio one.
Check the account status with the carrier
ReversibleA suspended account, a failed payment or a line ported away all present exactly like a hardware fault, and the phone cannot tell you the difference. This costs one call or one app check and it is skipped constantly.
Compare with another phone on the same network, same place
ReversibleBoth struggling is coverage and nothing on the phone will fix it. One struggling is the phone, the SIM or the account — and the router-equivalent excuse is gone.
Separate voice from data
ReversibleCalls working while data fails, or the reverse, points at carrier settings and the APN rather than at signal or hardware. That is a completely different investigation from no service at all.
Return network selection and preferred network to automatic
ReversibleA manual network selection or a mode pinned to 5G-only outlives the reason it was set, and both can exclude service that is genuinely available. Returning them to default is free and reversible.
Check for a carrier settings update
ReversibleCarrier profiles define how the phone talks to the network and they change. Applying an available update is safer and more likely to help than editing the APN by hand, which is easy to get wrong and hard to undo.
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
- CPH2513 and regional variants. OnePlus phone; OxygenOS version, region, alert slider/key, charging protocol and carrier certification vary.
- Tier — budget (Nord N-series)
- A budget OnePlus with 5G, a large battery and surprisingly fast wired charging for the price, but a modest chip and cameras and no alert slider or wireless charging. OxygenOS over Android. Limits are the tier, not faults.
- Fast charging
- Fast wired charging with the in-box charger and cable (a generic charger is slower); no wireless charging.
- Updates
- A shorter update window than the flagships; a missing newest feature is support age.
- Connector
- USB-C. A cable that fits is not necessarily a cable rated for this phone's charging speed — USB-C carries several power profiles and a cable built for data will charge slowly or intermittently while seating perfectly.
- Modem
- 5G capable. In marginal 5G coverage the phone hands repeatedly between 5G and LTE, which costs more battery and generates more heat than settling on either — so the preferred-network setting is a real diagnostic lever rather than a preference.
- Platform
- Android, with a manufacturer interface layer over it. Battery optimisation and background-execution restrictions are applied per app and are far more aggressive than on iOS — which is why 'set this app to unrestricted' is a real fix here and has no equivalent elsewhere.
- Symptom boundary
- This record covers OnePlus OnePlus Nord N30 5G when it has no cellular service or data. A different symptom on the same hardware, or this symptom on a different OnePlus 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, the line has been ported away, or the eSIM profile needs reissuing — all carrier actions.
- !The phone is carrier-locked and needs unlocking, which only the original carrier can do.
- !The fault follows the phone rather than the SIM, after a drop or liquid exposure — that is the radio or the antenna.
- !Coverage at the address is genuinely poor and the practical answer is Wi-Fi calling or a signal booster rather than anything on the phone.
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. OnePlus Support publishes this as "Support center". Official OnePlus manuals, software, repair and troubleshooting support. What that article does not carry is the model boundary — it is written for a product line, and CPH2513 and regional variants 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
My OnePlus Nord N30 doesn't have the alert slider or wireless charging.+
Correct — those are flagship features. The budget Nord N30 leaves out the alert slider (the physical mute switch) and wireless charging to hit its price, so their absence is by design, not a fault. It does include 5G, a big battery and fast wired charging (use the in-box charger and cable for full speed). For the alert slider and wireless charging you would need a flagship OnePlus like the OnePlus 12 or 13.
My phone says 'emergency calls only'. What does that mean?+
Usually that the phone has found a network and been refused by it — which points at the account or the SIM rather than at the radio. Check the account status with the carrier before doing anything to the phone; a suspended line and a failed radio look identical from the status bar.
How do I tell whether it is the phone or the network?+
Compare with another phone on the same carrier, same place, same time. Both struggling is coverage and nothing on your phone will change it. Only yours struggling narrows it to the phone, the SIM or the account — and the SIM-swap test separates those three definitively.
Calls work but mobile data does not.+
That split is diagnostic: the radio and the account are both fine, because calls prove them. What remains is carrier settings and the APN. Check for a carrier settings update rather than editing the APN by hand, which is easy to get wrong and hard to reverse.
Should I edit the APN?+
Only against the carrier's own published values, and only after checking for a carrier settings update. A hand-edited APN that is slightly wrong produces a phone that half works, and it is much harder to diagnose afterwards than the original problem.
Service keeps dropping in and out at home.+
Compare it against another phone on the same carrier there. If both are poor, that is coverage — and Wi-Fi calling is the practical answer rather than anything on the phone. Building construction matters a lot here: foil-backed insulation and low-emissivity glazing both attenuate heavily.
I bought the phone second-hand and the SIM does not work.+
Check the carrier-lock status in the phone's own settings. A handset locked to another carrier will show no service with a new SIM regardless of configuration, and only the original carrier can unlock it.
Would a signal booster help?+
Where the problem is genuinely weak coverage at a fixed address, yes. Where the problem is the account, the SIM or a manual network selection, no — and those are cheaper to exclude first. Establish that another phone on the same carrier is equally poor before spending anything.
Does this answer apply to every OnePlus model?+
No. It is scoped to CPH2513 and regional variants. OnePlus phone; OxygenOS version, region, alert slider/key, charging protocol and carrier certification vary.
What should I record before troubleshooting no service or cellular data?+
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 no service, cellular data. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Use the most reliable available path for emergency calls; do not delete the only eSIM without a replacement plan.
Answer for the exact device and software version shown above.