I have an iPhone 4 (CDMA), bought it to India and unlocked unofficially by jailbreaking.
Recently I upgraded to iOS 6.1.2, and now Cydia is missing. Everything else is working fine; I can make calls, use internet and Wi-Fi, however is gone from my phone.
How can I install Cydia again? I am afraid of Jailbreaking my iPhone again in case it will lock the phone again. Is there a method of installing Cydia back without reverting the unlock?