I have the same issue on the same iPhone.
Discovering on all around forums and internet that may be the baseband has been broken.
I have replaced the antenna assembly two times and I'm still getting the NO SERVICE msg.
So the issue is not linked on the antenna flex cable or antenna assembly.
Now I'm trying to get a new phone logic board that I hope to find.
I advice you to try this.
Step 1: Try to downgrade your FW to the 2.x version
Step 2: Modify your fw in order to install cydia
Step 3: Download FuzzyBaseband from cydia
Step 4: Try to downgrade your baseband
I hope you will get more luky then me.
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