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I used to purchase and use in country of my transient stay a prepaid sim of local provider. So that is not issue. Neither the device has any SIM lock in it. Unfortunately it is quite impossible for ATT not-customers to get in contact with AT&T in order to get these questions answered. Is it easy to get the access to information which radio frequency bands does AT&T UMTS network use in NM state? Is it easy to get access to information which radio frequency bands does AT&T LTE network use in NM state? Nor in case of Verizon is it easy to get oriented in those aspect prior coming to US.