I keep getting harassed by an unknown number

I have an iPhone, it calls every single day around the same time 3:00-3:30. I answered once but never spoke, all I hear is "hello? "And silence then I hang up the phone. Other than that I have been declining the call. What do I do!

How to unlock iphone 4 keypad?

I pressed hide keypad on my iphone4 by mistake & now the keypad is stuck on favorites & all other options are not working. I can't end the calls, can't dial any numbers. I tried the settings options to see if i can unhide the keypad but there doesn't seem to be anything there about keypad options.
Can you help me in this?
Will I have to restore it & loose everything?

If i jailbreak an iphone do i have to pay for service or on the contract?

I have an iphone and i was wondering if i jailbreak it is there a way that i don't have to pay for it no more? Like pay for anyhting

Added (1). Ik that jailbreaking is is getting stuff for free but i want to know for sure. Is there anyone that has an i phone that don't pay for their contrct or anything anymore and can still use it like nothing happened?

Syncing iphone to itunes without losing all my music?

The laptop that i originally synced my iphone with died abruptly. It blue screened and crashed and wouldn't turn on and it was old so i just decided to bury it and buy a new one. Now itunes is telling me that if i want to sync my phone up with this itunes library, i'll lose all the music currently on my phone. Which is *** great because i have a lot of music on my phone and not a lot on this itunes library. I can't get on my old laptop to do anything. So is there any way i can sync up my phone to this itunes to put new music on it WITHOUT losing everything on my phone now? Or should i have bought a droid instead?

IPhone secret folder Apps security?

Can anybody tell me that are the iPhone's lock folder i mean secret folder which are password protected, is there any possibility to access these folder remotely by the app programer, i mean to say that can the app creator steal or hack my private photos that i keep on these folder?

I'm so worried about the security of these folder, Please let me know.