So I've rooted my phone and added CM7. Sine then I have noticed a huge spike in data usage. Thankfully I have wifi because I'm on limited data plan. in about 3 days it has used a little over 1gb. I have pretty much the same apps as before so I have a hard time believing it's an apps fault but who knows? I'd estimate I've used around 500mb myself redownloading apps and game roms. so what is causing the rest of my data usage?