Poor 5G coverage

I bought the same phone as you and upgraded from a 4G iPhone XS Max. My experience dropped horribly. Sometimes as little as 3 Mbps!!! The new phone was worse than the old phone and I had dropped calls, trouble making calls, and I still have 1 bar of coverage in my living room and at my office in downtown Fort Lauderdale. Horrible experience. I filled a BBB.org complaint and T-Mobile offered 3 months free, which I took. Almost a year later and my coverage is barely better. 5G is a marketing hype. It's no better and can be worse than 4G. You can read up on the tech and why this is here. 

https://www.zdnet.com/article/why-is-my-5g-so-slow-comparing-the-hype-to-the-reality/

I have been suckered just like everyone else. And the article infers that this is no better with AT&T and Verizon. 

I wish I had my XS Max back. 
 

Everyone take care.