As cell phones became more advanced, the security features implemented to prevent misuse have also improved. The phone's keypad will lock after a period of inactivity to prevent buttons from being pushed accidentally. This can prevent accidental calls or menu activations. Another type of phone lock is when the phone company programs the phone to only operate with a SIM card issued by them. They do this as a way to ensure that you can't use another service provider, especially when you are in a roaming zone. It is easy to learn if your phone has either type of lock in place.
Things You'll Need
- Cell phone
- SIM card from another cell company
Data Entry Locks
Examine the screen on the phone and see if it reads "Keyguard" or some other phrase indicating that a screen lock is in effect.
Enter the first few digits of any phone number. If the numbers appear on the screen as you enter them, the phone is not locked.
Access the menu to launch a phone application, such as Internet or text message. If you are able to open the application, the phone is unlocked. If the keypad lock is activated, you should see that message when you try to open the program.
Service Provider Lock
Remove the SIM card from your phone. The SIM card is usually located under the battery. Take off the battery cover and remove the battery, which should expose the SIM card. Remove the SIM card by pulling or sliding it out. Some phones have a release latch for the SIM card that, when pushed, will slide the card out for you.
Insert a SIM card from another cell provider. It must be from a different company than the one you are testing.
Dial a phone number and call someone. If the call is completed and the phone works normally, the phone is not locked. If you get a message saying it can't complete the call or if it asks for a password, the phone is locked.
Tips & Warnings
- The SIM card tip only works with GSM phones. GSM (Global System for Mobile Communications) is a type of cell phone formatting used by most phones around the world. It is the international standard. If your phone is formatted as CDMA (Code Division Multiple Access), it is automatically locked to one service provider. Sprint, Nextel, and Verizon typically use CDMA.
- Photo Credit Jupiterimages/Photos.com/Getty Images
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