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 551 , you must have your IMEI number and a microSIM card from another service provider.
If you want to unlock your Samsung Galaxy 551 for free,Follow these steps:
Dial 8#06# and the Samsung Galaxy 551 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 551.
Once you receive your SIM unlock code from your service provider, turn off your Samsung Galaxy 551
Remove the microSIM card from the phone
Insert a microSIM card from another service provider and turn the Samsung Galaxy 551 back on
When prompted, enter the SIM unlock code sent to you by your service provider
Enjoy your Samsung Galaxy 551 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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