I'm looking at getting an iPhone from ebay?

So I'm no longer keeping my contract with Verizon, freakishly expensive, and I'm going to go with a prepaid plan, looking at straight talk. If I order an iPhone from ebay that's factory unlocked will I be able to use it with straight talk? What about if it's a verizon or AT&T phone (like a specific brand) would I still be able to use it with Straight Talk?

IPhone and Ipod disconnected from Wi-Fi?

So yesterday both my ipod and iphone disconnected from the Wi-Fi… I've been using this Wi-Fi for a long time. It works on the computer but every time i try and connect to my the Wi-Fi to my iphone and ipod the loading symbol just keeps moving. I've tried resetting the network password and my actual devices and it still doesn't work.

Internet runs slow on laptop but not iPhone?

Both are using the same Wi-Fi but when I try to get on a website on my laptop, it basically just stays on a white screen and says it's loading but never loads. Anyone know how to fix this?

My iPhone 4S is acting very strange?

So today I notice my iPhone keeps playing my iTunes music even though I didn't want it to play and Siri keeps turning on randomly! It's very strange, Siri comes on and then I exit out of Siri and my iTunes music starts to play and then it goes very very slow then it skips songs and then plays a song at a regular pace. I'm getting very frustrated because it's happening a lot! What could be the cause of this? Is it a virus? I don't go on any weird websites so I think it would be kind of impossible.

IPhone 4 in PERFECT condition, how much could it sell for?

I have an iphone 4 on perfect condition for AT&T right now it's not activated but I was wondering how much it could sell for? It has no scratches, no cracks, It looks brand new. I think it has 8gb but I'm not sure. I need at least 335 dollars… Could it sell for that much?

How to focus a picture after its taken?

So last night me and my friends took a really cute picture, but it didn't focus so it's all blurry. Is there anyway I can focus it now? It's on an iPhone 4s