Sound on my iphone won't work?

This morning i woke up and i tried to listen to a song and when i went to turn the volume up, the little circle thing was gone. Every now and then it will come back but itll only stay for a few minutes. I can't really use my phone if i can't hear when i get texts and calls and i can't listen to music or have my phone on speaker and its just a big inconvenience and a lil annoying. Why is it doing this and how can i change it back to normal?

My iPhone broken due to heat. What do I do?

I spent the last week in Italy and a couple of days in my iPhone 4s which I've had just over a year stopped working. I was playing a fairly simple game and listening to music in my hotel room when it froze, turned off and now I can't turn it on/ do anything.

I originally presumed it was internally damaged because I was using it outside and it was boiling to be fair but then it was working fine then and when I used it later at a perfect temperature it broke.

Firstly, is this my fault? And what should I do about it, should I contact my contract provider or Apple? Where will it be fixed?

How much does an iPhone 5 16gb cost?

I'm going to buy an iPhone 5 but how much does it cost with a contract with Sprint, Verizon, At&t?
On the Apple website, iPhone 5 16gb locked is 199$, but i don't understand, how long i have to pay 199$?
Eventually how much will i pay the iPhone?

My iPhone 5 speakers are raspy because of water?

I accidentally dropped my phone in my sink full of water. It still works, though when i play music out out or someone is calling me the sound is raspy. I put my phone in rice over night and nothing seemed to happen. Any suggestions?

Would this be cheaper than an iphone plan?

I have an iPhone 5 and I don't have a sim or plan with it. Could I just carry a mobile hotspot with me instead of getting a $100/month plan? If so, what carrier has the cheapest?

How to use an iPhone on tmobile?

I currently have an android phone with the tmobile network. I just bought an iPhone 4S from eBay that's locked on the AT&T network and I was planning to get it factory unlocked to be able to use with tmobile. However, I did not realize that it did not come with a SIM card. And I can't put my tmobile SIM card in it because it is not a micro SIM card and I believe that it would be rejected since its a different network's SIM card anyways. I've read that I can get a micro SIM card from the tmobile store. That solves the SIM card problem. But how do I get the iPhone unlocked to be able to use it with tmobile? I thought I knew what I was doing but I ran into a big problem. Someone please help.

How to let only my iPhone to receive my text messages?

So my iPhone, and my sister's iPad both share the same Apple ID. Today she told me she got my group message with me and my friends while we were texting each other. I can't remember if I was on iMessage or not. The question is how do I get my sister to not receive my texts from me and my contacts on my iPhone to her iPad, whether or not it is normal texting or iMessage.