Iphone 4 touch screen not working?

Got iphone not long ago, had vibrate fixed as the seller sold it faulty, since then the touch screen has been acting up, when i try to press the backspace it presses the keys around it, it won't sense any small thing i try and press but it is working just not so well, i've tried resetting it and it's not work and it's really annoying me. I got the vibrate fixed earlier today, do i go back to where i got it fixed and tell them? The only problem with that is the touch screen isn't really noticeabley not working and the man is foreign so he doesn't understand lot's of english, what do i do? I just want it to work (i emailed the guy who sold me the duff iphone so he sent me money to get it fixed)

I have an old iPhone 3GS that is disabled?

There's no way I can connect to iTunes because I synced it on an ex's computer and it will not allow me to do it on my own. Is there ANY way I can enable this phone either without a computer or can AT&T or iPhone employees be able to enable it? I don't have service on it as I have an iPhone 4.

My iPhone 4S keeps losing internet connection?

Sometimes when i try to open a new page it sometimes it says "safari can't open this page because your iPhone is not connected to the Internet" and when i open a new page or restart my phone its fine. Also, how do i connect to Wi-Fi, when i try it doesn't let me put it on, its just blocked

How to take a screenshot on iPhone 5?

So I've had 2 iPhone's prior to the iPhone 5, on each of them you could hold the sleep/wake and home button down to take a screen shot. However, I can't do this on my iPhone 5. I've even looked on how to use the accessibility feature to make a custom gesture for this, and it doesn't list the screenshot under favorites. Does anyone else have this problem? Do you know a work around?

IPhone 4 won't load anything

I let my iPhone charge for a while and when I came back every app took forever to load and I tried going onto Facebook and it said the connection was lost.

Sim failure help! Iphone 3gs?

I bought a iphone 3gs off ebay and put my sim in it but it keeps coming up with sim failure what do i do?
it was jailbroken when i bought it but it was an orange phone and i'm with orange now the software is all updated but nothing is working apart from my Wi-Fi please help

Added (1). Cydia is not working i can't open it now nothing is working