How to Add more Operating Frequencies ?

Hi guys,

I got a new moto g 3rd gen in India model XT1550, the phone is awsm and works great in India. There was no issue while using it on 4G or other operating networks in India.

But now I am in USA and I have a sim from a company called CampusSIMS. It offers some decent plans at a reasonable price. The problem is I am stuck on 2G network, whatever I do I cannot get 4G or 3G working on my phone. Later I read that mobile operating frequency for USA is different. Can anyone please tell me if any of the US carriers will support 4G on my phone. (Like does any US carrier has a operating frequency fully supported by my phone on 4g/3g)

I am planing to buy a family/group T-mobile plan with my room mates, so does anyone have any idea on how to add T-Mobile operating frequency on my phone. Is it even possible on moto g, cos i saw some post where people have success adding more operating frequency on their unlocked phone eg. samsung, zte etc. I like the phone and don't want to change it or buy a new one.

Any help regarding this is appreciated.

Thanks.