Cheapest webpage/way to buy a new iphone 4S?

I'm looking for a new phone and thinking to get an iphone 4S, i have already got a separate contract so just want any suggestions of ways to get a really cheap new iphone 4S any good cheap websites, i mean i know ebay is quite good but any others?

My iPhone 5 doesn't switch back to 4G?

Well when I lose signal for a little while it goes to EDGE as it should, but when I get full signal back it doesn't go back to 4G. I have to turn it off and on to get it back. What would cause this?

Is there any way of knowing if the date was modified?

My sister was supposed to send me a very important email by wednesday and she sent it thursday, claiming that she hit "send" but the email was not sent. I thought she had simply forgot and she showed me a draft of the email that was made on wednesday as proof that she did send it. However I suspect that she changed the date and time of her iPhone, created the draft, and then changed it back. Is there any way of knowing whether she did or didn't do this?

I found an iPhone 4S and want to take it back

Well, yesterday I found an iphone 4s and like an idiot I broke the sim card and restored the phone (I was going to take it back but there was the passcode). After reading a lot of threads, it seems like I might get in trouble when I get a new sim and put it in.

I live in the UK, and the phone had Vodafone simcard.

So my question is, what to do next? I do not want to take it to the police, and I thought I should take it to Vodafone and tell them I found it like that, so they can track the owner. Is that a good idea? Or I will get in even more trouble?

Any Ideas would be helpful.

Is my iPhone's speaker broken?

I have an old 3GS 16GB. Today, I found out that my phone doesn't make any sound from its built in speakers when I play music on its iPod. Even the volume bar isn't there. But I can hear music when I plug earphones or external speakers. Also it rings and produces all those alert sounds except when the screen locks or the tapping sound when I type. I can goto Settings --> Sounds and play any ringtone too.

Sometimes the sound comes and goes when I hold it upright for some time. Like RIGHT NOW, I can hear the tapping sound while I'm typing and it may disappear if I tilt the device to any other direction. While the sound remains, if I check my iPod, the volume bar will be there.

Does anyone know what could be causing this problem? Speaker hasn't burnt because I can hear ringtones etc too and right now I can hear the tapping too. Oh! Yes it hasn't disappeared yet. Lol. But when I tilt it this way like This, its going to be gone… See ita gone now.

The reason why I'm not selling or getting a new iPhone is because I need to keep all the messages I got from my girl friend. Don't wanna delete those. So if anyone knows a solution to this and also how to transfer SMS from one to the another iphone, let me know FAST for 10 points.

I got Nailpolish on my iPhone:/?

I have nailpolish on the home button on my iPhone. Can I take a q-tip with nail polish remover and wipe it off? Or will it ruin it?