Iphone 5s lost LTE, 4g, weak signal. dropped calls after upgrading to IOS 8.1

i recently upgraded my iphone 5s to IOS 8.1 , after the upgrade i lost LTE and 4g, connectivity and stuck to 3g, i observed that my phone's got weker signal than before, i have intermittent signal during calls, and dropped calls. i did go to my service provider but they cant figure it out too, because i'm in an area which has a very good LTE signal and i only got 3g. so i use the apple support chat and i did all the tips and software restoration, i even restore my iphone twice as a new phone but got no good result. i hope apple inc. should issue first a warning on their softaware release updates. i'm so frustrated with my IOS device which i'm so proud.

Hi Restore Back to Factory Settings over your WiFi Go to Settings iCloud check last backup. Since ios 7 when you put your iPhone or charge it Automatically backs up to iCloud After Restore just use same Apple ID Then you will get your Apps & data back. Cheers Brian

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I did.
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Iphone 5s lost LTE, 4g, weak signal. dropped calls after upgrading to IOS 8.1

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