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Buy a mobile device with a wider signal−detection span
If you live in an area where the network reception is weaker, you will need a stronger mobile device. Go to a store and purchase a mobile device which is able to get the maximum of the network you are subscribed to.
Note: If the factory reset didn't resolve the issue, consider doing a hard reset, but make sure to back up all the personal data(photos, videos, sounds) before doing the hard reset, because all the data stored on your device will be deleted.
Call the operator (carrier) you are subscribed to
It is possible that the operator (carrier) you are subscribed to experiences technical difficulties (e.g. power outage). Try calling their support team, from another device or via their website, and provide them with all the information they ask you for.
If you have exhausted all the options to fix your mobile device and you failed, it's possible that your device has a hardware defect which cannot be repair. If this is the case with your mobile device, consider buying a new one.