Unlock Phone For International Use At&t. IPhone offers the same innovative features regardless of the wireless carrier you choose. If you choose AT&T or T-Mobile as your wireless carrier, your iPhone will use either 3G or 4G LTE cellular technology for data services and voice services. IPhone can roam internationally on many GSM carriers around the world. If you buy an iPhone with AT&T or T-Mobile, it will not work if you switch to Sprint or Verizon. If you choose Sprint or Verizon as your wireless carrier, your iPhone will use CDMA cellular technology for voice and data services.

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If you buy an iPhone with Sprint or Verizon, it will work on AT&T or T-Mobile. An iPhone activated on Sprint or Verizon also has the ability to roam internationally on GSM networks. For details on LTE network support, please see. If you completed the carrier activation steps for AT&T, Sprint, or Verizon when you purchased your new iPhone online, it will arrive ready to use. Just turn it on and follow the onscreen instructions to set it up. If you chose to skip carrier activation at the time of purchase, you’ll need to insert an active SIM card or contact a carrier to set up an account.