Hello again, I have a htc Airtel ( Indian carrier ) locked hero. I know I can get it unlocked. However, that will void the warranty. Can someone please tell me what exactly happens when we "unlock" a phone?? Would we be able to lock it back if I need to send it to HTC for some repair? Would I be able to download latest software from htc without any issues? Would I be able to upgrade unlocked phone with new packages htc gives out?? Also, anyone in here using Airtel htc hero? or a unlocked version..whats the difference?? I know locked phones come with airtel apps..would I be able to delete them once I unlock the phone?? Thanks a ton!