How to unlock LG Optimus One-P500

If you are travelling, buy a local SIM card and save on roaming fees, you need to unlock your phone.

In order to unlock your LG Optimus One-P500 , you must have your IMEI number and a microSIM card from another service provider.
If you want to unlock your LG Optimus One-P500 for free,Follow these steps:

Dial 8#06# and the LG Optimus One-P500 IMEI code will appear on screen then record your IMEI number on paper.
Call your service provider’s customer service line and ask customer service for the SIM unlock code for your LG Optimus One-P500.
Once you receive your SIM unlock code from your service provider, turn off your LG Optimus One-P500
Remove the microSIM card from the phone
Insert a microSIM card from another service provider and turn the LG Optimus One-P500 back on
When prompted, enter the SIM unlock code sent to you by your service provider
Enjoy your LG Optimus One-P500 on any GSM carrier of your choice.

Of course, if you can not get IMEI number from the customer service,you can go to http://www.htcsimunlock.com/#oid=1141_1 for help.
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Unlocking your LG Optimus One-P500 doesn’t require cables, software, or any technical knowledge. The LG Optimus One-P500 sim unlock code that we provide you is the only official and permanent way to unlock your LG Optimus One-P500 straight from the HTC manufacturer. We have the sole ability to unlock HTC phones that no other companies can unlock. Your secure purchase is a completely Risk-Free experience with us!