4G is not worth it.
You're going to buy a new phone.
That phone will cost you $500+
That phone will die very quickly because that phone is looking for 4G signal constantly
In 2014, you will have spend another $500 on a new phone
Don't get a 4G phone. That's almost as good as buying BluRay movies before the players were invented. Just wait.
Plus, what the hell do you need 4G on a phone for? I can't imagine a 'life or death' situation where the 4G is really going to make that much of a difference. What phone are you downloading HD movies to from an FTP server on? None! Get a phone to have a phone. Get a tablet to play games, read books, watch movies. Get a PC/Mac to rule them all.
If, in 2014, there is 4G everywhere, and you happen to purchase a nice new phone that you like, and it so happens to have 4G, then there's an added perk. After buying the latest and greatest crap year after year to download the latest and greatest apps day after day, I finally got an LG Lucid because it was android, and I paid $50 for it. It makes calls, it send text messages, it can even give me directions! Hexacore, 2342GB phones are pointless. If I want to play an action shooter with great graphics, I get on my gaming rig and nerd out.
Edit: Cricket uses Sprint's network. You can get an Unlimited package and tethering for the same purpose as strollin, but outside of that, wait until 23423G comes out.