$70 solution to triple your monthly allotment? One SIM in phone, 2 SIMs via device.
Doesn't have much coverage - seems like 2g only over GSM.
Oh, good point, no LTE with this device. Guess unlocked AT&T hotspots is still the best way to do it.
Can you use FreedomPop LTE SIM in the phone for data and T-Mobile prepaid SIM in this device for voice and text?