The following issues arise due to poor network coverage:
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Poor call quality
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Break up or drop calls
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Network busy
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No service
Below are the troubleshooting tips to fix the issues.
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Check if the Razer Edge is up-to-date by performing a system update.
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Signal Troubleshooting
Check the network coverage on the Razer Edge. Move to a different location that is more open with fewer obstacles. Then, check the signal.
Note: Network signal is affected by walls, buildings, trees, and weather.
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Device Settings Troubleshooting
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Swipe down to display quick settings from your home screen.
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Ensure that the "Airplane mode" and "Do Not Disturb" are not enabled.

If they are enabled, tap the icon(s) to disable.
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Go to “Settings” > “Network & internet”.

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Go to “Mobile network”.

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Tap "Preferred network type".

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Ensure that the preferred network type is "5G/LTE/UMTS".

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Ruling Out
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If you are still experiencing the issue despite following the instructions above, perform a hard reset.
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If the issue persists, back up your phone data and perform a factory reset.