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Why I lose service on my iPhone 3GS all the time?

Hi I bought an iPhone second hand and it's pretty much riddled with problems.

The one which is annoying though is that a lot of times I lose signal and can't make or receive calls, and I get 'Call barring restrictions..etc' when I try calling otherwise.

My sim works in my other phone, any sim (including mine) works temporarily on my iPhone for 10 mins.

I don't want to pay Apple to repair, I'd rather do myself but I'm not sure what to change or fix.

I have tried resets/airplane/restore/3g off already.

Thanks.

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take a look inside the phone... make sure it is powered off first or you risk the lcd blowing, and check that the 2 grounding prongs at the bottom right of the motherboard and on the dock connector are making contact with the metal frame on your rear case.

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Thank you for your reply, I ordered some tools to open my phone safely and I will let you know the results as soon as I can.

I'm not entirely sure what you mean though, if you could link me to one of the pictures in the teardown or other guide that has the prongs I need to look for in it that would be great otherwise if it's just something I can't miss I should be okay.

I'm still open to any other suggestions though.

Thanks again

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apologies for the quality, also the dock connector may not look like yours..this one is a bit the worse for wear. It does show the 2 prongs...the one on the left is attached to the motherboard, the one on the right is attached to the flex which forms connector 7. you might like to check that is on properly (forgot that before)

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