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Take your SIM card from AT&T to a store that has a demo and ask to insert your SIM card and check to see if it works for you. The experience I've had with my Samsung branded cell phone that's supposed to be unlocked is that it keeps checking to see if the SIM card is a Verizon card and looks for the Verizon tower. That takes the phone offline for a couple seconds out of every 7 seconds. That indicates to me that the phone isn't truly unlocked and I suspect this tablet will see the same thing happen, but trying it at a store will tell you for sure.
Sorry, there was a problem. Please try again later.In the U.S., there are two wireless technologies in use: CDMA and GSM — and they're completely incompatible. Verizon and Sprint's networks use CDMA technology, while AT&T and T-Mobile are built on GSM. The big difference between the two is that GSM networks use a removable SIM card to identify subscribers on the network, while CDMA devices have electronic serial numbers embedded in the device and require specialist reprogramming to change networks. With a SIM card, you can quickly swap your service provider by removing your old card and inserting a new card into your phone. If your T-Mobile or AT&T phone is unlocked, you should have no problems swapping SIM cards between devices on these networks. Since the network operators launched LTE networks, it's become a little easier. All LTE networks in the U.S. are built using GSM technology, so newer Sprint and Verizon LTE-enabled handsets include a SIM card and may work on all GSM networks, big and small. It depends on the way specific phones are designed though. Some older phones only use the SIM card for LTE services, meaning that even if you can switch to a new GSM network, you might not be able to access 2G and 3G services for calls and messaging.
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