Cellular on the Apple Watch SE (2nd generation) is available only on the cellular model, and it needs a plan with your carrier set up on the watch. Apple's cellular setup page and its page on Bluetooth, Wi-Fi and cellular explain how the watch chooses: it uses the paired iPhone first, then known Wi-Fi, then cellular. To see whether the watch has a cellular connection, open Control Center; the Cellular button is green when connected. If cellular does not work, check that the plan is active, turn Airplane Mode on both the iPhone and the watch for fifteen seconds and off again, and restart both.
Check the Watch app, Cellular, to see that the plan is shown and that cellular is on. Cellular only works with a supported carrier and with a compatible iPhone and watch, so a watch bought in another country may not connect. If the cellular plan shows in the Watch app but the watch will not use it, check that Cellular is turned on in the watch's Settings, Cellular, and that the plan was set up for this watch and not an older one. A plan can be bound to a previous watch until the carrier moves it.
Differential
Likely causes of “Apple Watch SE (2nd generation) cellular service is not working”, and how to tell them apart
- 1
A watch without cellular
What separates it No cellular option appears
How to confirm Check the watch's model: only GPS + Cellular watches can connect
- 2
The plan is not active
What separates it The Cellular button stays gray
How to confirm Contact the carrier to activate or fix the plan
- 3
The watch stays on the iPhone
What separates it It does not use cellular near the iPhone
How to confirm Cellular is used when the iPhone is not nearby
- 4
Airplane Mode or a glitch
What separates it No connection after a trip
How to confirm Toggle Airplane Mode on both devices and restart them
- 5
An unsupported carrier or country
What separates it Setup fails
How to confirm Ask the carrier about the watch
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the watch is a cellular model
- The carrier and plan status
- The color of the Cellular button in Control Center
- Whether the iPhone is nearby
Try in this order
0 of 8 completedOpen Control Center
ReversiblePress the side button and look at the Cellular button.
Check the plan in the Watch app
ReversibleOn the iPhone, My Watch, Cellular, and confirm the plan.
Toggle Airplane Mode
ReversibleTurn it on for both devices for fifteen seconds and off again.
Restart both devices
ReversibleRestart the iPhone and the watch.
Test away from the iPhone
ReversibleLeave the iPhone and see whether cellular takes over.
Contact the carrier
ReversibleIf the plan is not active.
Check the plan is attached to this watch
ReversibleOn the iPhone, Watch app, Cellular, confirm the plan lists your watch's model and number.
Ask the carrier to refresh the plan
ReversibleIf the plan was moved from an older watch, the carrier may need to provision it again.
Model-specific
What is true of this model and not of its siblings
- Priority
- The watch uses the iPhone, then Wi-Fi, then cellular.
- Plans
- Cellular needs a carrier plan on the watch.
- Old watch plans
- A plan can remain tied to a previous watch.
- Roaming
- Cellular watches may not roam outside your plan's area.
Stop boundary
When this stops being a self-service repair
- !If the plan is active and the watch never connects, contact the carrier
- !If setup fails with an error, contact Apple Support
- !Check the carrier supports the SE 2
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does my Apple Watch not have cellular?+
Only the cellular model does.
When does the watch use cellular?+
When the iPhone and known Wi-Fi are not available.
What does a green Cellular button mean?+
It has a cellular connection.
Do I need a separate plan?+
Yes, through your carrier.
Can I use the watch's cellular abroad?+
It depends on the carrier.
Why does cellular not work after changing watches?+
The plan may not have moved.