I unlocked my 1.1.2 OTB using Ziphone 2.5 after I restored firmware 1.1.4. It worked fine for over a week, but then since monday afternoon, i was unable to make or receive any calls. The funny thing is that i'm still able to send & receive sms. I have tried to restore, downgrade and unlock it several times again....no luck! I have full signal, and it picks up VodaCom without a problem... I just cant make & receive any calls ("call failed" everytime). It does work with my friends Cell C SIM though...I also tried MTN and its also 100% fine. Any suggestions? Has this happened to anyone?