Music won't play on iPhone 4S?

I dropped it in a little water 3 months ago now when I put my earphones in the music doesn't make a sound or even when I have it unplugged it still doesn't play. But my ringtones make sound so is there a way I can get my speakers fixed or is it a lost cause?

Will my Iphone still say 3G if it is disconnected?

I have an Iphone 4s and it is updated to IOS 7 and It says I have 3G and I have signal but everytime I send a message it says that the message was not delivered and it won't let me use the internet or anything that requires data such as Facebook, Instagram, Twitter, etc. I tried resetting my network settings but it didn't work. I can still call and stuff, but I'm not sure what else to try. Thanks in advance for any help.

Added (1). I can also receive text messages.

Iphone apps disapeared after an update?

I did an update on my phone, and when i turned it back on, all my apps were gone except for the ones that already came with the iphone. When i go to the app store and try to download them, i will type one in like "facebook" and on the top right where it usually says "free", it now says "open".so i can get to facebook that way but i want to download it to my iphone like it was before. How do i do this?

Have any alternative way to charge my iPhone 4s smartphone?

Actually i'm using iPhone 4s and i believe iPhone is most complicated from others brands phone. I saw now a days many people are using various types apps for make more user friendly their phone. But i'm apple product user so i don't see any trusted apps and accessories. By the way my question is i need a different method to charge my phone. I want to rest my regular charger. So please if you have proper experience about iPhone charging method, please give me a helpful answer.

Can I go to the apple center/store to fix my iphone that was purchased on eBay?

I just purchased and received a iPhone 4S on eBay but after a few hours I noticed the Wi-Fi would not connect anymore and now it is completely greyed out. I tried to reset network settings twice, it didn't work and then I just decided to erase all content and settings since there was nothing on it to begin with.

I noticed a lot of people on forums with the iPhone 4S was having similar problems and I read that I could get the Wi-Fi chip replaced to fix the situation entirely but I don't know if I can take it to an Apple center because it was purchased off of eBay.

Does anyone know if I can still take it to Apple and have them fix it or is there another way to have the problem fixed somewhere else?

How to move music video's from itunes to my camera roll?

I have downloaded alot of music video's from the itunes app (on my iphone) but i want to post them on instagram. I usually use the app "free video" to dowload video's from youtube to my camera roll but these arn't on youtube, just itunes. Is there an app i can use? Anyone know?!