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My 3G and 4G is not working on SAMSUNG SGH-I747M. It's an AT&T version of S3 so according to specifications it must support both. Can anyone tell what should I modify in order to get it working?

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Reset to default
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Check if your settings are correct.

Go to Settings → More networks → Mobile network → Network mode and select as the image below is selected. If this doesn't work it may be the signal strength in your area

(Click image to enlarge)

IMG:

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  • Well i can select this but to no effect. Signal strength is okay, other devices are working fine in the same area.
    – Bilal Qamar
    Sep 6, 2015 at 10:25

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