How to unlock Samsung Galaxy Attain 4G

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 Samsung Galaxy Attain 4G , you must have your IMEI number and a microSIM card from another service provider.
If you want to unlock your Samsung Galaxy Attain 4G for free,Follow these steps:

Dial 8#06# and the Samsung Galaxy Attain 4G 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 Samsung Galaxy Attain 4G.
Once you receive your SIM unlock code from your service provider, turn off your Samsung Galaxy Attain 4G
Remove the microSIM card from the phone
Insert a microSIM card from another service provider and turn the Samsung Galaxy Attain 4G back on
When prompted, enter the SIM unlock code sent to you by your service provider
Enjoy your Samsung Galaxy Attain 4G 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 Samsung Galaxy Attain 4G doesn’t require cables, software, or any technical knowledge. The Samsung Galaxy Attain 4G sim unlock code that we provide you is the only official and permanent way to unlock your Samsung Galaxy Attain 4G 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!