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LarsRas
User level: Level 1 (43 points)

Watchos 27 unable to activate mobile plan.

Iphone 16 pro max ios 27 and until today a watch s9 with watchos 27 and TDC mobile plan activated.

Got a watch S12 (also has watchos 27) which replaced the S9.

I'm unable to got mobile plan activation successfull in the ios watch app.

All are ok at carrier side, and watch app starts activating TDC. After some seconds it just ends in unable to activate mobile plan.

Have tried several times. Watch restart. Reset mobile plans in the ios watch app.


Anybody have similar issues?

br


Posted on Sep 18, 2026 10:09 AM

1 reply

Ingo2711
User level: Level 10 (93,009 points)

Sep 18, 2026 11:31 AM in response to LarsRas

Just to be sure, your iPhone is connected to the cellular network and Safari can also use it?

...

  • Make sure your Apple Watch supports cellular. If you're not sure, you can identify your Apple Watch to learn more.
  • Make sure you have an eligible cellular service plan with a supported carrier. Your iPhone and Apple Watch must use the same carrier,* and you must be within your carrier's network when you set up cellular on your watch.
  • If you have an enterprise or corporate cellular service plan, check with your company or carrier to see if they support this feature. Pre-paid accounts and some older accounts aren’t currently supported. To make sure your account is eligible, contact your carrier.
  • Make sure you have the latest software on your iPhone and your Apple Watch.
  • Check for updates to your carrier settings.
  • On the iPhone that you use to set up your Apple Watch, check that cellular data is turned on for Safari. Open Settings, tap Cellular, then scroll to the Cellular Data section. Tap Show All, then make sure Safari is turned on.

...

If you don't activate cellular when you set up your watch, you can do it later:


  1. On your iPhone, open the Apple Watch app.
  2. Tap the My Watch tab, then tap Cellular.
  3. Tap Set Up Cellular.
  4. Follow the instructions for your carrier. Contact your carrier if you need help.

...

copied from: Set up cellular on Apple Watch - Apple Support

Originally posted at discussions.apple.com/thread/256359891