Models:

• iPhone 6 / 6 Plus:
  1. A1549 / A1522
  2. A1586 / A1593
• iPhone 6s / 6s Plus
  1. A1633 / A1634
  2. A1688 / A1687 (lacks LTE Band 30)
• iPhone 7 / 7 Plus
  1. A1660 / A1661
  2. A1778 / A1784 (lacks TD-SCDMA (Chinese 3G) and CDMA EV-DO 3G)

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Networks:

AT&T:

• 3G:UMTS/HSPA+ Bands 5 and 2.
• 4G LTE:
  • Primary Bands: 12, 17, 14 ,29
  • Extra Capacity: 5, 2, 4, 30, 66

Verizon:

• 2G/3G (voice/data): CDMA EV-DO Bands: 0, 1
• 4G LTE:
  • Primary Bands: 2, 4, 13

T-Mobile:

• 2G GSM/GPRS/EDGE: Band 2
• 3G UMTS/HSPA+: Bands 2 and 4
• 4G LTE: Bands 71, 12, 5, 4, 66