New Apple Watch not connecting to cellular

This is ridiculous! I have had my Apple Watch for 2 months and have been unable to use it ether due to the same challenges. I am very frustrated because T-Mobile seems to be clueless about how to fix the issue and is shifting blame. Clearly it is an issue. Has anyone has an issue recently on this?

Same issue. T-mobile sent me a new sim I never asked for and kept getting annoying alerts about notifying me that I needed to switch my sim to the new t-mobile one and as soon as I did, my watch had no cellular service and I can’t find a way to fix it. I’ve been paying for it for 3 months now with no cellular service since it stopped working after that. So frustrating. My watch worked fine for a whole year until then. Now i never even wear it and am paying monthly for the service. They need to get it together. If I put my old sprint sim back in it, will it work? I still have it as I swapped the sims myself after they sent it to me in the mail and not by someone in store. Help!!!!

I had an almost identical experience & have the same series 5 watch that I’ve had working fine for a year until 3 months ago when that whole t-noble SIM card switch from sprint they kept insisting on with annoying notifications so they sent me one in the mail and I switched it out and my phone works fine but my watch they don’t seem to be able to figure out. We did all of those same steps repeatedly for hours out of my dad with nothing to show for it. They seem clueless that this is an issue and one that apparently many of us are experiencing. I’m past the point of ****** off this has gone on so long and meanwhile, they are still charging me for the cellular plan on my watch this whole time I haven’t been able to use it. 3 months. Ugh. Let me know if you eventually get any solution or answer to this mess.

I’m having the same issue I hope it’s fixed soon.

I’ll try this today if they can’t give me a fix at TMobile.

Does anyone know if this issue ever got resolved?

Still happening. On phone with Apple now. I went to sprint and they said they couldn’t switch me back to the sprint sim. Looks like based on the thread this shouldn’t be a problem correct ?

Did you ever get your SE watch to work as a stand alone watch? I've literally invested almost 20 hours with Verizon trying to get my son's watch up and running.

Problem is fixed. I installed two T-Mobile sims in two different Sprint phones yesterday and both Sprint watches stayed connected cellular.

Same issue with switching from Sprint to TMobile SIM card. Apple Watch not able to function as a stand alone. Still not fixed and Sprint/ TMobile support seem clueless.

See my comment above.

Went to Sprint last night with a new iPhone pro max for my wife and had a sprint sim installed. Works with her watch fine.