iPhone Activation Unavailable

Earlier this morning I decided it was time to update my iphone 2g from 3.0 to 3.1.3. I figured it would be a smart idea to restore first considering the fact i wanted to rid of the music on my phone. Restoration went fine until i had to activate. When plugging in my phone it said, iPhone Activations are unavailable at this time. it then continues to tell me to try again later. Just wondering if anyone is having the same problem and if anyone knows when it will be back up?

Thank you