Why won't my iPhone 3GS connect to my carrier?

I currently have 3 iPhones. Two work great but one will not connect to the carrier. The phone is locked to Rogers (in Canada) but no sim card I have tried has worked so far even though all are from Rogers. The phone just continues to search for the carrier and displays "no service". I've contacted Rogers with no success and the people at the Apple store says it does connect but they never showed me it working.
What can I do to get this iPhone working? It's a 32 Gb iPhone 3GS.

There are a myriad of possibilities. To try the easiest first, turn off your Netgear router for 15 seconds, then turn it back on. Sometimes the DHCP daemon (the software that assigns IP addreeses in the router) dies and needs to be rebooted.
Next is to verify that your router has the latest firmware version from the manufacturer's web site.
Other steps are to go into Settings/WiFi and attempt to connect, then tap thr right arrow next to the network name and tap "forget this network". Then reboot the phone and try again.
Next go into Settings/General/Reset and Reset Network settings.

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Hi waplington123,
If your iPhone will not start up unless connected to power, you may want to troubleshoot using the steps in this article -
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Specifically -
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
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The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
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If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Thanks for using Apple Support Communities.
Best,
Brett L

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try this article
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-TH
<Edited By Host>

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Why won't my iPhone 3GS connect to my carrier?

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