Move closer to the WiFi router
Restart your mobile phone
Restart the WiFi router
Turn WiFi off and on again
Forget the network and reconnect
Switch to the 5 GHz band if available
Disable VPN
Close background apps
Turn off mobile data auto-switching
Update your phone software
Update the router firmware
Remove phone case if it blocks signal
Reduce interference from other devices
Change the router location
Limit the number of connected devices
Clear network settings on your phone
Use a WiFi analyzer to find a better channel
Change the router WiFi channel
Use a stronger router or mesh system
Check for malware or suspicious apps