So, I just got a new cell phone and company?

So I just got a new phone from Virgin Mobile the Optimus V. Everything was working fine last night and now whenever I try to get onto Goggle Search it says my web page is not available. My phone a has signal, ut it is kind of low. And when I try to enter the Android market it says a network error has occurred. I have unlimited everything, I also tried turning on ad off my phone. Help with how i can fix this ??