For all HTC we have 3 unlocking databases:
1. old models for HTC produced before May of 2010
2. new base, more expensive is for HTC produced after May of 2010
3. the latest base, most expensive is for HTC produced after November of 2011

If You don’t know what is Your HTC unlocking database just use our “HTC IMEI Tester”
HTC unlocking database IMEI tester

Go to site from this link and type Your HTC IMEI number, You can check Your HTC IMEI number by typing *#06# or just remove battery from Your phone. IMEI number is written under the battery label.