Default Problems with Metropcs data


i am trying to get in my lgg2 4g i live in miami 33014 i have full 4g lte coverage in my place but in my phone only have 2g... i cant get 4g and i pay for 4g plan my phone is tmobile. i think is the same apn for metropcs i am looking for some answer in this forum i try everithing but wit out luck myphone was rooted. the technician told that is the problem for 2g... i bought the phone already rooted yesterday i sow a link to unrooted i did but still have 2g any help please

Thanks in advance