Kindly follow the below settings:
realme UI 3.0 & above versions: Settings > System/Additional Settings > Backup & reset > Reset phone > Reset Network settings only.
realme UI 2.0: Settings > Additional Settings > Backup & reset > Erase all Data > Reset Network settings only.
realme UI R & Go & T & S Edition: Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth.
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