My iPhone4 is not receiving calls?

Two days ago my iPhone was receiving calls normally, Just today my friend and my mom both told me they can't reach me and my phone doesn't ring at all or even show a missed call!
according to my mom it says something like " this user disabled getting calls " or something like that. What do I do?! I'm waiting for an important call!

LOST MY IPHONE AND NEED MY CONTACTS BACK?

I recently lost my iphone 5 and I got a new one but I need my contacts back. I had lots of important numbers on my old phone, is there any way to sync them on my new phone? I use the same iTunes account.

Sprint contract ended but it still shows in signal?

I have a sprint iphone and my contract ended but on the signal sign, it still says "sprint". And i still get voicemails from my sprint number and can't log in to imessage and/or facetime since my sprint line is deactivated and my phone is sprint, so its as if they cut off my network line and now i can't log in… I don't know what to do? I can't reset my phone for reasons (even with backup) … What do i do?

Can I switch to a iphone? (really short)?

Ok I have a blackberry and its contract ends in 5 months. Over the break my mom promised me an iphone so my blackberry will be handed over to my younger sister.
2 questions.
Can we change the plan up a bit to make it suitable for her and less cheaper (keep in mind there's still 6 months left)?
Can I keep the same number?

Can I use my itunes purchases on phones other than iPhone?

I'm looking into buying a new phone and I love my iPhone (4) but everyone keeps talking about the Samsung Galaxy and I love the size of the Samsung Note but I've purchased a lot of songs on iTunes and I want to make sure that if i decide to buy a different phone that I"ll still be able to hear my songs on it?

Also any phone suggestions would be greatly appreciated.

How to take my iPhone to the USA without incurring any extra charges?

I would like to know if there's any way possible to take my iPhone to the USA without incurring any extra charges to the bill? I can't afford anything more than my current tariff and I don't want to make any calls or send any texts. I want it purely for Wi-Fi and music. Is there a way to turn the service off from my phone or something?

I can't have any more money charged to my account for out of country usage on the network or something like that! Also, I leave tomorrow, so please answer as soon as possible!

Cydia works but the packages won't work?

I got a tether jailbreak with my iphone 4 ios7 with rage break and i would download a package and it will do nothing to my device and it will install winterboard and sbsetting but nothing else and i rejailbroke it twice

Did I go wrong? Or would it seem desperate to try again?

There's this one girl in my class who I've kept my eye out for for while now but I never really racked up the nerves to talk to her. Finally as finals started rolling around I set my goal to get her number so I started making small chat with her and eventually got her number. I got it because everyone was leaving school and I saw her by her locker and went up to her, started a conversation and when we both started to go our separate ways I asked her for it and she gave it to me what seemed happily. So I waited about a day and I finally texted her. Her and I both have iPhones so I saw she read my text message. I also know she wasn't busy that night cuz she posted on Instagram that she was just sitting at home. Did I go wrong somewhere? And would it seem desperate if I tried texting her again in a couple of days? Sorry about this guys cuz I know high school crushes should be the least of my worries but I just want to know what I did wrong or if I should try again.