Hey everybody!!

My dad just bought an iPhone 3G, and he wanted me to unlock it, I ofc said no problem, since I thought it should be rather easy, and I done it lots of times!

I tried this

Restoring to 3.0 version
jailbreaking with RedSn0w (win) + Cydia.
Unlocking with Ultrasn0w

But I can't get a signal - What should I do?

The iPhone is now @ version 3.0 (dunno about baseband) and jailbreaked.

What could I do now?