Restored my Iphone and now i have no service?

I've had this phone for a year (iphone 4) and i had no more room on it for anything. It wouldnt even let me take a picture. So i restored it, i deleted everything on it and i started it out as a new iphone and re-downloaded my apps. It says i have no service and i don't know what to do? Do i have to activate it again?

Did you 'restart' the phone? Because when I reactivated my iPhone it showed I had no services/bars even though I did. If you're not getting any calls though, then take it up to your carrier.

Try taking out your sim and putting it back in. If that doesn't fix the issue, you might need a new sim and would have to take it up with either your carrier or apple.