If Nothing We Suggest Helps
If you tried every trick in the book (this one) and still have a malfunctioning iPhone, it’s time to consider shipping it off to the iPhone hospital (better known as Apple, Inc.). The repair is free if your iPhone is still under its one-year limited warranty.
Here are a few things you should do before you take your phone in to be repaired:
Your iPhone is erased during its repair, so you should sync your iPhone with iTunes before you take it in, if you can. If you can’t and you entered data on the phone since your last sync, such as a contact or an appointment, the data won’t be there when you restore your iPhone upon its return.
Remove any third-party accessories, such as a case or screen protector.
Remove the SIM card from your iPhone (as described in the earlier section ...