Problems Switching From WiFi

Hi,

I've had problems with my service since I joined VOO Mobile.

Very often it doesn't switch to the mobile network when I leave a place where I have a WiFi connection.

I thought it may have been my phone but I've recently bought a new one and still have exactly the same issue.

I can sometimes get it working by switching flight mode on and off but that is not an ideal solution as I'm often driving at the time.