How to fix no signal/service problem on iphone 4?

Recently my iphone 4 has begun to go in and out of service and signal all of the time. I have realized that when I turn off cellular data and 3g network, this issue is resolved. But how do I get back to using my phone w/ data and 3g without having this issue?

I have exactly the same problem, its only started happening the last day, its quite fustrating.
Whenever I turn on data and 3G it very rarely goes to a 3G signal and stays on that circle/edge data. Very occasionly it will say I have a 3G signal but infact it still cant load anything at all. I've tried restoring network settings and I am just about to try reseating my sim card but I doubt that will work! Could it be something to do with one of the antennas?

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Regards
From: Pat Willener <[email protected]>
To: Said Ahghari <[email protected]>
Sent: Saturday, 10 January 2015, 3:58
Subject: How to fix windows 7 cannot find AcroRd32.exe file problem as Reader cannot be opened and nor the pdf files.
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How to fix no signal/service problem on iphone 4?

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