My iPhone 4S won't accept calls or texts when locked?

When my phone is locked, my phone doesn't ring, or make a noise when I get a text? But when I look on my phone it says I've got a missed call and I have a text. Also, when people try calling me, it says I'm unavailable, please help! It was working fine last week!

Survey for people who have the iPhone 5

So for my Language Arts project, I have to create an article about the iPhone 5, and I have to interview someone about the iPhone 5. However, no one close that I know has the iPhone 5. Can you please answer these questions about the iPhone 5 for me please? Also, type your first and last name with your answers, or if you don't want people to know your name, just say "unknown". Also, please try to write in appropriate language (no swears, and good grammar). Thanks So much!

Questions:

1. What is your favorite feature about the iPhone 5?

2. What is the biggest difference to you about the iPhone 5 and the iPhone 4s?

3. What is your overall opinion about the iPhone 5?

Please be descriptive!

Make an iphone 4 prepaid?

If you can, how? I have read that you buy the iphone full price, buy a prepaid phone, and then put the prepaid sim card into the iphone, but, if this is true, which prepaid phone should I get? Does it matter? Also, which plan should I get?

How to update to a specific iOS?

I have an unlocked/jailbroke iphone 3gs. I have iOS 4.1? I want to update to at least 5? Why can't I see emojis? This is not a factory unlocked phone.

Using an iPhone 4S that was found?

My mom works at a restaurant and she found an iPhone 4S on the floor. She took it home and contacted the owner's relative to notify them about the lost phone. The owner came in contact with my mom and told her that they would come pick it up. My mom waited and waited and the owner never came to pick it up.

I don't have a phone, so my mom thought of giving me the phone since the owner never came to pick it up. If she does give me the phone, could me or my mom get into any legal problems?

How to transfer mp3 files to a mac?

I have a lot of songs on my PC laptop, but i'm getting a macbook pro soon, and want to transfer them and use them with itunes for an iphone. I don't have a flash drive, but was going to put my music on a DVD possibly to move the files. Can i drag the files from the DVD to a location on the mac? Should i look into a flash drive? What's the standard method for this?

Added (1). Also, can macs open.zip files?