You can enable wifi calling and VOLTE thru T-Mobile via the secret dialer codes. Google it.Same here. I had to get a Mint Mobile sim for it. They use T-Mobile's Network and if you put the IMEI on T-Mobile's checker, it will say it isn't compatible but it is. Works fine on Mint except my house happens to be a T-Mobile dead zone. Oddly enough, customer service at Mint Mobile will also tell you that it's not compatible if you contact them about it. Kind of annoying, honestly
Yeah, I think it's all band 13 where I live, more of a rural area. However, I will try to disable carrier check and see how it goes. Actually have a Verizon signal extender at my house but hotswapping the vzw sim resulted in no signal.It should work on vzw, my mi 11 ultra CN rom is working right now and is sitting on band 2. I did notice though I had no signal until I disabled carrier check for volte thru the dialer with the hidden code and after I rebooted it worked on vzw. Just make sure your sim is activated in another phone first and you be good to go. Also Depending on where you live and availability of other bands your service will definitely not be the same but honestly in NJ and NYC I haven't noticed a difference yet.