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Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.

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no GSM signal, only week 3G signal -100db

I fell on my iPhone and i shattered the screen, after a complete tear down and screen replacement, i have problems with my GSM Signal

it only works on 3G with very low strength -100db, and when i hold it "Death Grip" it looses all the signal, when i turn off 3G, it finds Edge for one second then NO Service appears.

Wifi and GPS signal are strong and fine

what i did so far:

The blue capacitor beside the battery connector is there and working fine, I rebuilt it twice, changed the Sim card, did a network restore, iOS update, the speakers "3G Antenna" metal connectors to the body are all there

What i doubt :

The Chases is a little bent in the middle due to the fall, and i am missing a rubber thing on the top of the phone over the camera "lost it while replacing the screen"

I would really appreciate it if anyone can help out

Answer this question I have this problem too

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Im with the same problem... Already changed the Cellular antenna and nothing

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I replaced my midframe and I consistently get 1-2 bars less than my wife's stock iPhone 4. Blue inductor is present. I cleaned the cellular antenna connector wire and socket with alcohol and it still get's 10-15dBm lower. I do know when I replaced the speaker/antenna assembly, 2 of the 4 prongs broke off, but I thought they were for EMI purposes only? I'm thinking the blue anodized finish of my midframe is causing a connection problem, perhaps at the brass tab/screw to the right of the assembly (opposite the connector to the board). I guess I'll replace the GSM antenna assembly next as well as sand off the anodized finish of the frame where the screw is that I was speaking of.

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