Fully Functional: This item has been professionally tested in all of the following areas and is guaranteed to be functional
Locked vs. Unlocked Wireless Devices
There are two main technologies in mobile phones. CDMA and GSM represent a gap you can't cross. This is the reason you can't use AT&T phones on Verizon's network and vice versa. Which Carries are CDMA? Which are GSM? In the U.S.,
Sprint, Verizon, Boost Mobile, and U.S. Cellular use CDMA.
AT&T, T-Mobile, Metro PCS, and Cellular One use GSM.
With GSM customer info is stored on a removable SIM card.
With CDMA customer info is stored on a network-based white lists.
This means you can only switch phones with your carrier's permission, AND the carrier does NOT have to accept a particular phone onto its network. So it’s important to ask your provider if the phone you want is compatible.
In other words, you CAN take an unlocked AT&T phone over to T-Mobile (but its 3G may not work well because the frequency bands are different) But you CAN NOT take a Verizon phone over to Sprint, because Sprint's network rejects non-Sprint phones.
Unlocking a device, if you’re not the original contract owner, is impossible in some cases and can be very costly, and this is why an unlocked phone may cost more than a locked phone of the same model.
If you are unsure if you are picking the right phone please contact us directly or your cellular service provider before making this important purchase.