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Yes you can,however you will need to contact AT&T first to get the Network Unlock Code Key. Once the phone is unlocked,call Straight talk so they can activate their service on your AT&T phone and you may use your sim card then.
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AT&TMake sure the SIM card is installed and the device is turned on. ... Activate your AT&T Certified Pre-Owned phone or learn about Certified Pre-Owned from AT&T. ... You canactivate your device from your AT&T wireless phone, tablet, PC, or laptop in many circumstances, including:
The phone must be unlocked.
Then go to ATT or get a straight talk sim card for ATT towers.
Then open an account and assign the account to the sim card.
Stick the sim card in the phone and set the tower settings as required and you are online.
You just need a fresh sim card, linked to your account.
From what I know, this phone is used through ATT, so Im assuming this is your carrier? If so, you will need to contact ATT for a sim card for this phone. If there is already a SIM card in the phone, you can contact att to activate you on that SIM card.
Well, first off, an iPhone won't work at all with a T-Mobile SIM card. American iPhones are locked to AT&T's network -- only AT&T SIM cards will work in them.
As far as activating it with AT&T, make sure that the iPhone isn't connected to the computer while you install iTunes. Once iTunes is installed, connect the iPhone to the computer and iTunes should launch automatically and begin the activation wizard. Just follow the instructions on the screen and answer the questions.