First step in unlocking your HTC Vivo is getting the unlock code.
It can be purchased by clicking here:HTC Vivo Unlock Code
How To Enter the Unlock Code?
1.Switch ON mobile with a not Allowed SIM Card.
2.If phone ask, enter the PIN code of your SIM Card
3.Now phone will ask you to enter the unlocking code
4.Enter Unlock Code we send to you.
5.Your phone is now unlocked.
Unlocking your phone is as easy as 1-2-3.
HTC Vivo Unlock Code