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Most mobile phones rely on a small card called a SIM (subscriber identity module) to make phone calls and send text messages. Without it, your phone isn't able to connect with the cellular network and ...

For foreign mobile phonesA model that has two SIM card slots and can switch lines when necessaryAlthough in Japan there is strong connection between mobile phone companies and handset manufacturers ...

The iPad 3G may require a micro SIM—a lilliputian SIM card incompatible with anything else you own—but AT&T will be selling each bundled with a full SIM card adapter—meaning you could potentially use ...