Businesses that provide employees with cell phones may want to reduce costs by limiting the phone numbers the employees can call. The Samsung SGH-T619 has a Fixed Dial Number, or FDN mode, which ...
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How to lock your SIM on Android
Your phone's SIM card allows the device to make calls, send texts, and connect to the internet. The SIM card provides a phone number that identifies your device on the carrier's network, whether it's ...
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