My iPhone won't send or receive anything

I have an iPhone 4 and it is in decent condition, nothing wrong with it. It all of a sudden while I was in class stop sending and receiving messages and calls. My calls go through all the way to voice mail, but do not show up on the other phone (My friend and I tried many things) Same goes for when someone calls me. I have reset it a few times, and nothing happens except for a few old facebook messages pop up each time? I want to try to avoid a hard reset because I've heard that it won't even work… Does anyone know what is wrong with my phone?

Added (1). It just said I wasn't subscribed to a cellular data network when I tried to look at my updates

What is the same shape as an iPhone? And weight?

Please help, I bought my Mum an iPhone for mothers day, and the delivery man came with it this morning while I was at college, and my Mum got it. She didn't open it but she immediately thought it was a mobile, so the surprise I had lined up has gone.

What is the same sort of shape, and weight as an iPhone 4 which I can go out and get to trick her into thinking that is what I had bought?

Where/how to get my iphone 4 repaired?

I have been searching online for iphone 4 repairs and replacement parts, and every website advertises repairs for a cracked screen. My screen is not cracked at all but the white parts at the top and corners have been dented and gouged from falling. I'm assuming that a whole front screen replacement would be the only way to repair this, but I'm just wondering if there are any recommended sites or companies that would be able to fix it.

How come I can't iMessage this person?

I have an iPod touch and I want to iMessage my frien who has an iPhone, which means he has iMessage but everytime I try to iMessage him it says this person is not registered with iMessage and I can't text him. How do I change this?

Faulty replacement iPhone 5?

The scenario is that my grandma and grandad went halves to buy me this iPhone 5 for Christmas but they let me have it as soon as it arrived in November as my contract at the time was approaching end.
Anyway, as soon as I got it set up, I noticed a battery draining issue. I tried it for a few weeks and even one night where I needed it I had no battery and I'd hardly used it.

We took it to the Apple Store where the guy did a deeper software reset, that made no difference and so it went back this Saturday just gone.
It was about 24 hours after the exchange happened, I was looking at an album on the iTunes Store and was contemplating whether to but it or not, when I saw like a scratch, but I hadn't dropped it or scratched it, and so I looked carefully and found a few dead pixels.

I've just done a test online and there are quite a few dead pixels around the screen.

I only notice the first few if I look carefully, but because I know it's there, it bothers me and it bothers me that my grandparents have spent £599 on nothing but troubled iPhones

I have another Genius Bar appointment booked for Sunday, what will they more than likely do?

My iPhone keeps freezing and turning off?

It's a Verizon iPhone flashed to cricket and it's jail broken. And recently it started freezing and just turning off and it's getting annoying what's wrong with it?

Problems with ear? Swooshing sounds?

I was playing my iphone one night and heard a swooshing noise, it was coming from my ear. Its the first time it happened to me…
What is it? Why is it happening?

I'm 13, I'm very Stressed/Depressed,
I listen to Skrillex (Electronic type music) it can get a bit loud.

I think it was a day before it happen I realized it was a bit harder to hear in my right ear. I thought it was earwax so i took some Q-tips and there was quite a bit of earwax, but it wasn't enough, so i took a bath (witch i hadn't had one in a while) got out went to bed and the next moning at school I went deaf in my right ear for a minute.
And had small problems hearing as well as normal.
And then i went home and played on my phone an then my LEFT ear was ringing… Thanks,
It happened march 4th-5th

Why iphone is hot under camera after battery replacement?

I changed my iphone 4 battery last week. The battery is not original, My Iphone used to become hot in the area under camera a little while charging or using it alot, Now it is like before but the heat is more, Do you know which part is always heating the iphone specially when I charge it? (I know that battery itself never heats up, the only place is under camera)