Looking For an iPhone or a Device with all Upgraded Features?

I need to get a new cell phone. I currently have a Samsung Messager rch631 with Cricket. I've had my cell phone for 2 years, since May of 2011 and I had problems with it 2 weeks after getting it. The screen no longer works, but it still turns on. I want a cell phone that has All brand new upgraded and updated features and easy to use. I also have an outdated iPod Touch Generation 2, so with both devices, I'm outdated and can't do much with them. I want a cell phone that'll include everything that I have on my iPod except updated and also a cell phone plan. It pretty much sounds like I want an iPhone. I want to go out this weekend and get one, but I want to do plenty of research before I get one.

How long do iPhone's last? Where can I get a good deal for an iPhone? How long is it for an IOS to go out of date? What would probably be the best phone that I'm looking for?

Anyone that can help me with further information and tips, I'd definitely appreciate it!

Added (1). My carrier is Cricket Wireless.

Do you qualify for an upgrade? Who's your carrier?

You can use this tool to find lots of compatible games and apps for your iPod Touch 2nd generation in the iTunes store:
https://sites.google.com/site/iossearch/