Hi, I had a HTC Hero which I sold to a friend. Before sending him the phone I Goolged how to log my Google account out of the Hero so that my friend could log in under his account. The answer I found on a multitude of website was to perform a hard reset of the phone, back to factory setting. As such, I performed the Factory Reset but the phone was originally Unlocked. Now my friend is saying he cannot make calls with ihs Tesco mobile sim. Would the reset cancel the unlocking and revert the phone back to locked to a network? Please confirm this and let me know asap! Thanks in advance!