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After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

Smartphones are susceptible to malware and carriers have enabled NSA snooping, but the prevailing wisdom has it there's still one part of your mobile phone that remains safe and un-hackable: your SIM ...

If you've just got your hands on a shiny new Sim card, congratulations. Switching your Sim (the chip that dictates your allowance) can unlock huge savings. Now comes the crucial step of activating it ...