How to check the sim lock status of HTC phone

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For GSM phone (AT&T, T-Mobile etc):

Insert a sim card from a different carrierTurn on the HTC phone. If the phone is locked, it will prompt you with "Network is locked, please input unlock code"

For CDMA phone (Verizon, Sprint etc):

Turn off the phoneHold down the Volume Down + Power keys. It will show the flash screenIt should say "SPL-0.57 Cmonex" if the phone is unlocked

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