T-Mobile has committed to keeping their 2G network operational until 2020 for these M2M devices - and they support the same GSM bands as AT&T does. Unless these

T-Mobile has committed to keeping their 2G network operational until 2020 for these M2M devices - and they support the same GSM bands as AT&T does. Unless these device manufacturers want to rush to put LTE radios in everything they'd be wise to just replace everything with T-Mobile SIM's and work on a better upgrade plan over the next 4 years.