Answer to "Constantly searching for signal."Had the same issue here. Solution: - Recheck the connection of cellular data antenna (Step 15) - Recheck the connections (Step 18) Those connectors are tricky (IMHO). Check for damage.- I destroyed one in my old 3GS (pushed to hard) - had to have it resoldered - Be patient and carefull !!! - They have to "snap" in. - Start the Phone - get your Sim-Card out - plug it in again. Hope this helps.