you get what you paid for, tmobile is always kinda bad and dont have good coverage anywhere outside large urban area, they actually roam onto some other network in the rural area iirc

verizon has the best coverage and they have the biggest lte network, they are going to have 700mhz/band13 lte radio at all their current existing 3g sites with extra lte band 4/aws/1700mhz reinforcing the urban area with extra bandwidth

att is probably the next best carrier with good 3g coverage but their lte network is new and not as widespread yet

pretty much stay away from everything else, there are a lot of smaller provider that sells cheaper lte deals with big data cap because they are using sprint's or some other carrier's lte coverage, which is bad


like someone mentioned earlier, try and find a 3rd party mobile provider like straight talk that actually uses big carrier's network, the best setup i've seen is use the 45 dollar/month straight talk sim on a compatible lte phone, so you can use att's lte network with decent cap for a decent price

also note that in the US, LTE is called LTE, 4G is the the hspa+ thing and basically a fake 4g, thanks to tmobile rebranding their 3.5g network to 4G to compete 'because we have similar actual speed' even though they weren't using LTE, so every other carriers didn't want to feel left out and start calling their non LTE stuff 4G

if you see 4G on your phone in the US then it means you actually only have 3.5G with the hspa+ thing and not LTE