would the att lumia 640 work perfect on tmobile?

[Goosinurwife]

i cant ask this over at the windows central forum so im askin it here sorry but its a important question if i unlock the lumia 640 will it work perfectly on tmobile ?


2nd choice would be to just stay on att

 

[pkcable]

Upon research it appears you need the dual SIM LTE model for T-Mobile.