The SIM cards that fit into those tiny slots in your cell phone and tell your cellular network to whom your calls are to be charged come in four different sizes. With the only real difference between ...

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If you're in the market for an unlocked iPhone 5 and need to fit your existing SIM card in it, you can actually cut your current SIM card down to nano size at home. Most people won't need to do this, ...

While most people seem to manage just fine with a single SIM card in their smartphone, some -- especially travelers, who can save money by fitting a local SIM card into their handset -- love the ...