Don't know, but definitely something with 4G LTE. I'm quite a bit pissed off at boost that in all of my dealings with them before buying my new sgs2 I was never warned they were going to start offering 4g LTE. I knew it was going to happen, but I was thinking third quarter this year so I wasn't willing to wait. Had I known it would have been 35 days (mind you, within 30 days you can return your phone for a refund) after my purchase, I would have held out.
I still might stick around with boost though, if I can pay the extra $10/mo for tethering and that equate to no data cap (I suspect this, but do not know if it's true), it would probably be worth it. My data service is spotty anyway though, hardly ever get good service and where I live is the worst of it. Might be in my best interest to find a provider that I can get reliable internet from since I rely on it so much (and honestly, i use like less than 100 minutes per month and 100 texts per month, i use my phone to have the internet away from my computer basically)