I turned on my iphone today, and somehow my contacts are erased. I cannot add any contacts, and when i try, it goes back to the home screen. And also, i cannot send any text messages. I re "unlocked" the phone, and it does the same thing. It has been working good for 4 months now, and all of the sudden, it doesnt. PLEASE, if someone can help, i will be really thankfull.