The Complete Guide to SIM Cards

nomi sim card chipA Subscriber Identity Module Card, or SIM Card, provides a way to identify the user of a phone on a mobile phone network. Being able to swap SIM Cards between phones allows mobile phone users to make calls on any phone that contains their SIM Card (when the phone has not been locked to a particular mobile service provider). SIM Cards can also be used to store contacts, which can also be transferred between phones.

This guide provides a number of troubleshooting steps that you can take to solve some common issues that relate to SIM Cards, as well as some common mobile phone tips and tricks.

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    Simple Guide to Copying WinMo Contacts to SIM

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    How to Unblock Nokia SIM

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    How to Retrieve Deleted Texts from an Android SIM

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    Will My iPhone Work With Other Providers?

    Can the iPhone be used on other wireless networks besides AT&T? Yes, but the answer isn't so simple. We'll explore compatibility with Verizon, T-Mobile, Sprint and Alltel, and show you...

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Unblocking Nokia SIM card requires PUK (personal unblocking key) that only the mobile network operator can provide. PUK should not be entered incorrectly, or else you just destroyed...