Word on the street is t mobile uses Verizon towers in nc,
If this was in the g'rage I could say a lot more. Many here know that until a few years ago I worked for one of the nations largest providers to pretty much every major telecommunication company including cellular, fiber, and copper. There are still active litigation cases of which at least 2 of I am a named party in...so I have to be real clear when I make a comment if its opinion or a statement of fact.
First this is a statement of fact - the above quoted post is 100% inaccurate. There are only 3 current nation wide network/tower/hardware operators. Verizon, T-Mobile and ATT. Saying that TMO uses VZW towers would be like suggesting that Ford uses Mopar engines in their trucks. Would never happen.
Now this is opinion - and not educated opinion formed by insider knowledge, just regular old conjecture and personal opinion. For many years VZW dominated the coverage map. ATT wasnt concerned cellular was a secondary or tirtiary business unit behind POTS/FIBER/Satellite tv programming. VZW started retiring less prolific towers to reduce costs, many of those towers were rural and were areas they were the only provider. The logic was, err seemed to be, if we are the only coverage - why maintain? Where are they going to go?
ATT got scared and started investing heavily into tower infrastructure pre-covid and continued after. On a national mega scale, ATT now has better coverage than VZW....none of that matters for your local specific pin.
Mixed in all this TMO decided to get feisty and try and steal market share. They partnered with some tower cowboys. They've come a long long way. They might have the best 5G tech going. They have (or had) a few silver bullets no one else did.
Beyond all that - its all a game and a bunch of MVNOs have better pricing with potentially worse service ...but contract language can also cause some counterintuitive advantages to MVNOs in highly congested spaces. But I really cant expand on that...