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If you are using Wifi, switch your router off and switch it on again.
If you are using mobile data, turn Airplane mode on and off to reconnect.
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If you are using Wifi, move closer to the router or move it closer to you. Keep line of sight with your router.
If you are using mobile network, move to a place with better signal and avoid being underground.
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Check the Wifi networks available and connect to the one with the strongest signal.
If you are currently using a Wifi network with a weak connection, such as a public network, switch to mobile network.