However, the iPhone for AT&T and T-Mobile can roam internationally on many GSM carriers around the world. Sprint, Verizon Wireless, and SIM-free. If Sprint or Verizon Wireless is your wireless carrier, your iPhone will work on AT&T and T-Mobile once activated. The SIM-free iPhone will work with any carrier.
AT&T and T-Mobile models of the iPhone 7 won't fully work on Verizon or Sprint as they do not support the old CDMA standard used by those networks. How To Know If Your Iphone 4 Is Unlocked. Apple highlighted the difference on the technical specification page for the iPhone 7. Models A1778 and A1784 do not support CDMA networks, such as those used by Verizon and Sprint. The reason these models don't support CDMA is likely Apple's decision to diversify suppliers for the modem in the AT&T and T-Mobile models and Qualcomm for the modem in the other models.
Re/code this is likely the case, 'Sources familiar with the situation as well as outsiders agree that the modem diversification effort is the likely reason for the separate phone versions. Apple Iphone 5s Silver 16gb Unlocked Gsm Smartphone. Apple and Intel declined to comment on the matter, and a Qualcomm representative was not immediately available for comment.' Please follow iClarified on,,, or for updates.