My iPhone 4 has very frequent network drops. It's completely random and nothing to do with weak network spots. Certain locations work great sometimes, worse other times. I 'reset network settings' on average 5 times a day. If I'm at my desk, signal is great 60% of time. Then when it drops, I 'reset network settings' and that resolves issue. I've reported the issue to my network provider and they informed me of the procedure of sending it in to one of their contracted repair shops. I've done this and they claimed that there was no fault recorded and replicated thus they could not repair/send for replacement. That was 6 months ago. The network provider have been extremely hard to deal with and it's taken this long to get in touch with a manager. He's informed me to drop the phone into another one of this firms shops. (i) Any thoughts on the actual problem itself? (ii) What to mention to repair staff? I currently have phone interviews and it's awkward not being able to trust phone's signal.