Cingular, now The New AT&T, utilizes SIM cards for their phones. If you are looking for a pre owned cell phone for Cingular, I have included a link below. Hope this helps.
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No, the cell phones have to be from the same service provider in order for them to work.
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There are services like http://www.buddyway.com/ that track any phone. Be aware this uses a seperate system and not the GPS chip in your phone.
There is not a cell phone that itself can restrict the Internet but some cell phone networks like Verizon can restrict it from their servers. It really depends on what network you are on.
Any verizon cell pohne that has a chip in it can go international. Almsot any cell phone in the market today can be used in an international overseas marekt.
sim chips
it will only work if you take the sim chip out of one and put it in the other, but not at the same time You can buy dual sim phones for the purpose of having two lines or world traveling
A sim card is a chip in your phone that holds information as to your phones identity such as your phone number. A sim card can be transferred to another phone allowing you to have to same phone number as well as your contacts.
No it wont you need to get the Verizon cell phone unlocked for the T-mobile chip to work. Look on the Internet as to how to do this.
Many smartphones support GPS apps including the iPhone and tHe Blackberry. If your current phone does not support GPS apps, you can purchase a GPS receiver chip.
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