Iphone 3gs keeps turning off unexpectedly?

I've had this iphone for about 2 years and only recently this has started happening! Basically, I can turn it on, but it only works for a minute if i'm lucky, although, if I plug it into a charger, it stays on. I'm 15, i'm not constantly in my house and I need my phone for going out and about, people have suggested to me that if I update the current software on to my phone (witch is IOS 6.1.3) then this problem will be resolved, is this true?

Which phone to buy? IPhone 5 or any other phone?

Hi I'm Harsha from India, I'm apple fan boy for so many years I got apple iPod, iPad now I want to buy a new phone I'm stuck up with which phone to buy? Either go with my natural love towards iPhone or any other phone? Even though I love apple somewhere in my mind its saying if I bring iPhone its gonna be same iOS, same icons, similar features, everything will be the same as I used in iPod and iPad, I'm feeling like wanting some change in my phone. But I still love iOS. Which one to buy? Apple iPhone or similar phone in htc or Samsung?

How to use iMessage on an iPhone 3g without service?

I know on iPods and iPads you can use iMessage via Wi-Fi and email, but how doi do it on an iphone 3g? A friend of mine git a new iphone so he gave me his old one, and I wanted to use imessage but there's currently no cellular service

Using my iPhone 5 abroad without extra charge?

So basically I'm going on holiday soon to Spain for two weeks. I recently got an iPhone 5, which I want to take with me, mainly for the camera but also for music. But obviously I don't want to get heavily charged - As this has happened before with previous phones. I'm just wondering if I keep my phone on Air plane mode for the whole holiday, will that stop me from being able to receive texts/phone calls, and from being able to use the Internet? If so, does this mean I can't get charged any extra? Also, the villa I'm going to be staying in has FREE Wi-Fi, can I connect to Wi-Fi while on Air plane mode? When at the Villa, and iMessage my boyfriend who also has an iPhone 5, as this is done through Wi-Fi, so they won't be any extra charge will there?

Turtle Beach z11 headset only work one ear (New)?

I just go my turtle beach Z11 and the sound only works in the right ear with the splitter and without, when i used it on my andriod phone it only works in the left ear, when i used it with my Moms iphone 4 it worked fine? Any solutions
Also where is the serial number on this product so i can claim a warranty

Can i use an iphone as a hub?

I have an ipad and a regular computer in my home. I use a bt hub to connect to the internet. If i buy an iphone could i use this instead of bt to get on my internet? If i can. Is it worth it? Is it just as fast etc. Or am i better off sticking with my bt hub?

any help would be so much appreciated