Apple ipod

I installed the software on my iPhone 3G and something went wrong please help?

I installed the new iPhone OS 4.0 and delete all soft ceramic (contacts, emails, texts, images, applications, music, etc) and need to know how to recover if you can. And the functions are not available on the iPhone 3G OS 4.0?

You have to keep all your data and orders on the phone. If not, then you've lost everything. Otherwise, I do not know much about OS 4.0

iPhone OS 4.0: All the New Features