After one month of fine usage, my iPhone cannot connect to or recognize any cellular network.

After one month of using iPhone 4s w/o any problems, it started to go off and on from cellular network. Now it is only "Searching..." for networks unable to connect. When I switch off "automatic carriers" it's the same. I already tried to swith off/on airplane mode and device but w/o success. Help, please...

I too are experiencing the same problem on a 8gig 3G Telstra Australia iPhone that was bought outright. I also have another (same) iPhone and the settings on both are identical yet the new phone refuses to connect. I have tried a few ideas/suggestions including: settings, general, network, cellular data network and changing it from telstra.iph to telstra.internet. this works but I think something is wrong because to .iph refers to iPhone (I have switched it back until to confirm with telstra about this).
I have also tried settings, reset, reset network settings but this did not help but has worked for others.
I have also tried turning off the unit and taking out the sim card and restarting the iPhone but again no luck yet.
I plan to speak to both Telstra and Apple to see if this problem has a simple solution and will post a new thread titled "solution to cellular network problems".
Personally by all the trials and errors so far I believe it is a carrier problem and having to re-enter the pin on this phone everytime I re-boot it suggests it could be sim card related.

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Hello Komanaut and welcome to the BlackBerry Support Community Forums.
Sorry to hear you're experiencing issues with your email.
To clarify, are the emails deleted off your device and your email account on the computer? Or just on your device?
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Replacing or even suggesting replacing hardware without doing basic troubleshooting first is not very smart.
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Thanks for your reply.
I just tried your suggestion, but got the same error.
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I

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Not sure what the shortcut is. I'm just going, Settings > Mail > Add Account > Gmail
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Hi Lawrence,
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Thanks, Rob.

After one month of fine usage, my iPhone cannot connect to or recognize any cellular network.

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