WiFi stays on beyond range of router and won’t revert to Cellular

Hey Rossfromuk,

Thanks for using Apple Support Communities. Let's reset the network settings to see if data saved there is causing this to happen. Here's more information on this reset and how to complete it: Return iPhone settings to their defaults - Apple Support

Reset Network Settings: All network settings are removed. In addition, the device name assigned in Settings > General > About is reset to “iPhone,” and manually trusted certificates (such as for websites) are changed to untrusted.

Cellular data roaming may also be turned off. (See View or change cellular data settings on iPhone.)

When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile or mobile device management (MDM) are removed. Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and Ask to Join Networks settings remain turned on.

To remove VPN settings installed by a configuration profile, go to Settings > General > VPN & Device Management, select the configuration profile, then tap Remove Profile. This also removes other settings and accounts provided by the profile. See Install or remove configuration profiles on iPhone.

To remove network settings installed by MDM, go to Settings > General > VPN & Device Management, select the management, then tap Remove Management. This also removes other settings and certificates provided by MDM. See “Mobile device management (MDM)” in the Deployment Reference for iPhone and iPad.

After resetting the network settings, connect to your network again to see if this resolves the issue. Keep us posted.

Take care!