My Samsung Galaxy S2 keeps saying not registered on network when I try to phone also a no entry sign where the signal bars should be keeps randomly appearing.
Does anyone know how to fix it or whats happening?
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It sounds like you may need to reset your APN settings, Your phone will be slightly different than mine, I'm using a Nexus 4. Try locating the following:
Settings -> Wireless & Networks -> Mobile Networks -> Access Point Names -> and from there locate the "Reset to default" option.
If that doesn't work, you can backup your device, and factory reset it.
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