T-Mobile - 2, 4, 5, 12 (3, 7, and 20 also listed on website)
AT&T - 2, 4, 5, 12, 17, 29, 30 (1 and 3 also listed on website)
Verizon - 2, 4, 5, 7, 13 (3 also listed on website)
FCC approved these bands to be used by each model. If it's not an approved band (i.e. tested) it shouldn't be able to be activated. Now the hardware is probably identical, so you may be able to reflash the modem or whatever to the correct carrier, but without doing that, I can't imagine them working across each network fully.
AT&T model should have no problem going to T-Mobile (supports all 4 bands).
AT&T model likely won't work well going to Verizon (7 seems hit or miss on importance, 13 seems pretty important for 700MHz).
Verizon model should kinda work on T-Mobile (except 700MHz on 12, eek).
Verizon model likely won't work well going to AT&T (no 12 or 17 support).
T-Mobile model should be functional going to AT&T (17 is redundant with 12, 29 seems rare, 30 is nowhere as of Sept 2015).
T-Mobile model likely won't work well going to Verizon (7 seems hit or miss on importance, 13 seems pretty important for 700MHz).
AT&T - 2, 4, 5, 12, 17, 29, 30 (1 and 3 also listed on website)
Verizon - 2, 4, 5, 7, 13 (3 also listed on website)
FCC approved these bands to be used by each model. If it's not an approved band (i.e. tested) it shouldn't be able to be activated. Now the hardware is probably identical, so you may be able to reflash the modem or whatever to the correct carrier, but without doing that, I can't imagine them working across each network fully.
AT&T model should have no problem going to T-Mobile (supports all 4 bands).
AT&T model likely won't work well going to Verizon (7 seems hit or miss on importance, 13 seems pretty important for 700MHz).
Verizon model should kinda work on T-Mobile (except 700MHz on 12, eek).
Verizon model likely won't work well going to AT&T (no 12 or 17 support).
T-Mobile model should be functional going to AT&T (17 is redundant with 12, 29 seems rare, 30 is nowhere as of Sept 2015).
T-Mobile model likely won't work well going to Verizon (7 seems hit or miss on importance, 13 seems pretty important for 700MHz).
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