Can't make or receive calls to other numbers on my account

Have you tried powering off the devices experiencing issues for at least 5 minutes each to allow them to refresh their connection to the T-Mobile network?

As soon as I get back to the United States am switching to another carrier I can’t even call to to pay my bills which is due in two days this is very frustrating 

We have been having this same problem on our account, on and off, for more than a year. 

Let’s be clear; this is not a device problem nor is it a roaming issue. I have the most problems getting these calls when home in my apartment, which is most definitely in-network on the maps, as is my sister’s house a few minutes away. There are 4 phone lines on our account, and at times none of them can call one another without it going straight to voicemail and immediately appearing as a missed call on the receivers phone - when said receiving phone never ran - but calls from other cell phones or landlines ring the phones normally.

And between those 4 lines we have two Pixel 6’s, two Samsung A32s (one of which was broken and replaced by protection plan last fall) and a Galaxy S10e. Whatever is causing this is not going to be fixed with standard device troubleshooting steps. Our account also isn’t really new. We were with Sprint for years and were transitioned to the T-Mobile side of billing and account-management about 2 years ago now.

Every indication is that, for reasons I can’t fathom, this is an account/network problem. And this problem got a lot worse at the end of 2023 - been basically a weekly occurrence since last October.

Yes, as best I can tell this has only happened when we’re calling one another from our respective homes. Though I can’t think of a reason why landline calls would come through just fine, to our cell phones in our homes, but cell calls from others on our account do not go through. And yes, in the exact same time we’re having these weird down periods, I have been able to make calls to other numbers just fine, it’s only calls to family members that don’t go through properly. 

I turned off Wifi Calling settings as a potential fix months ago and it didn’t change anything - I never turned it back on, so mine are strictly normal mobile. I think my sister still has hers turned on, no idea whether my son or his fiancé have that setting turned on.