Intermittent Incoming Calls Going Straight to Voicemail with No Ring

T-Mobile network is faulty and that's a fact. they will try to deny it and run a test and the stores don't know anything that's mostly just some kids in there. They don't have a clue when you call customer service they run a test over the phone and then tell you it's your device I just got a brand new iPhone set up yesterday and I am looking at the same problems as with my other phone that I just warranted out and just got done setting up today it's a network problem and based on all this feedback on this page it's been going on for years. All my settings are turned off of call, blocking call, forwarding unknown, caller, blocking, etc. I've had Sim card switched out on my old phone I've had everything possible done and then I warrant out my iPhone and I'm on a brand new iPhone today and my brother is standing right next to me calling me numerous times and only  half the calls are coming through the other half go straight to voicemail so obviously I've been wasting tons of time. Thanks to T-Mobile warranting out phones through Apple and sitting at the iPhone store at the mall numerous times in the last couple weeks because T-Mobile keeps trying to deny that it's their fault and it's their issue and saying it was my iPhone which obviously it's not. I'm sitting here right now at my office with a brand new iPhone that's less than 24 hours old and just got done downloading all my stuff from my other phone and it's the exact same problem 🤬🤬🤬🤬🤬