Iphone 3GS wont hold signal

ive put my sim card in my phone & it detects it but it just says searching & when it does connect 2 my provider it cuts out & says no service, any suggestions???

Try the following:
Re-seat the SIM card.
Clean the SIM card with an eraser.
Replace SIM Card.
Reset device
Restore device from backup.
Restore as new.
If none of those resolve the issue, then you have a hardware problem.

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Hello estebie67,
Thanks for the question, and welcome to Apple Support Communities.
It sounds like the iPhone is experiencing issues upon startup, and may not be loading the firmware or operating system correctly. If you have not already done so, try resetting the iPhone while connected to power:
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http://support.apple.com/kb/HT1430
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If this is the case, no support can be provided here.

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If I was in your shoes, I would choose to restore the iPhone with iTunes and then choose to NOT restore a previous backup. I'd then go on to set up the phone as though it were totally new, and choose the stuff to load onto it.
The reason I'd go through that trouble.. even though it meant losing a lot of settings and having to set stuff up again .. is because I wasn't sure I could trust the backup that it's restoring from.
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If you actually see a "6" error code, here's what it means. Disable your anti-virus and/or firewall.
Errors related to third-party security software
Error 2, 4 (or -4), 6, 1000, 9006
Follow Troubleshooting security software. Often, uninstalling third-party security software will resolve these errors.
There may be third-party software that modifies your default packet size in Windows by inserting a TcpWindowSize entry into your registry. Your default packet size being set incorrectly can cause these errors. Contact the manufacturer of the software that installed the packet size modification for assistance or follow this article by Microsoft: How to reset Internet Protocol (TCP/IP).
Verify that access to ports 80 and 443 are allowed on your network.
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Discard the .ipsw file, open iTunes and attempt to download the update again. See the steps underAdvanced Steps > Rename, move, or delete the iOS software file (.ipsw) below for file locations.
Restore your device while connected to a different network.
Restore using a different computer.

Iphone 3GS wont hold signal

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