Apple Watch Ultra - suddenly says No SIM - No Connection

Have you set up your Apple Watch and cellular was working, then it stopped? It seems like this problem is happening for many people. I tried googling it and ended up here with no answers. I just solved it! Here's how:

I turned off my watch and turned it back on.
I updated my iOS software
I opened the Watch app on my iphone, went to "Cellular" and clicked on the "i" under my cellular plan. I removed the plan
I added a new plan (it was the same as the original plan)

Problem solved!

Apple Watch Ultra

Posted on Jun 22, 2023 2:03 PM

Top-ranking reply

theboeuf

Level 1

8 points

Posted on Jul 18, 2024 11:16 AM

I had a similar problem with my Apple Watch 7. I noticed some of my apps weren't working as expected and it turned out that they weren't able to access the Internet without my phone. I tried restarting the phone and the watch several times, which did not solve the problem. The "no sim" problem persisted regardless of proximity to the iPhone.

What appears to have solved my issue was "refreshing my connection" via my cellular provider. I have AT&T and here's what I did:

Logged into my account on AT&T (on my computer)
Clicked on the "Get Support" button on the left-hand side
Clicked on the "Get Wireless Help" button
Clicked on the "Refresh my connection" button and confirmed

After a few moments, it said it was done and to restart the watch. I restarted the watch and a couple minutes later the issue was gone. I hope this helps.

Side notes: I was not able to "remove my plan" in the Apple Watch app on my iPhone; I just kept getting a message that it was unable to remove the plan. The iPhone, Apple Watch, and all apps were already up-to-date (iOS 17.5.1, and WatchOS 10.5 both current at the time of the problem).

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Apple Watch Ultra - suddenly says No SIM - No Connection

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