Can you use an iphone 5 with straight talk?

I'm just curious to know if you can or not.

Straight talk sells regular sim cards, micro sim cards, but they do not sell nano sim cards.

Can you make one work with straight talk?

Someone stole my iPhone 5. What now?

I went to a gig in Wales (almost 200 miles away) and someone stole my iPhone 5 from my bag.
"Find my iPhone" won't work because my phones apparently offline so I'm guessing they've disconnected it or something. It's not insured.

I'm back home and cancelled the sim and ordered a new one. Will I have to buy a new iPhone or will they let me restart my contract? I don't have the money for a new one ):
I'm with Network 3

Can you upgrade from an iPhone 3GS to an iPhone 5s?

I've had an iPhone 3GS for a while now and I'm almost due for an upgrade. Do I have to get an iPhone 4 or can I upgrade to an iPhone 5s? I have AT&T by the way. Can I do it without having to pay a thousand dollars?

ZTE Awe by VirginMobile. Jailbreak? Or Similair?

I just got a ZTE Awe phone by virgin mobile, to replace my iPhone. I jailbreaked the iPhone pretty easily, because it's a popular brand. The ZTE Awe isn't so popular, so I can't find any jailbreaks, is there any jailbreaks available?