Firstly hello to everyone....This is my first post and need your help..I have an iphone 3gs and had a mishap in iTunes which i accidentally upgraded to 5.0.1 and firmware 05.16.05,the problem i have is that it says i have no service,i cannot call or send/recieve messages etc,can anyone help me with this situation.

Thank you

You may have really backed yourself into a corner. Let us know the following:

1) What carrier is the phone locked to? If you don't know, let us know the model number and we can figure that out.
2) What carrier are you attempting to use the phone on?
3) What are the 3rd, 4th, and 5th numbers of the iPhone's Serial Number? (Do not post the full serial number please, just the 3rd, 4th, and 5th digits)

We should be able to help with that information.