Budge1962 wrote:
If I turn wifi on or off I do it by swiping the screen upwards.
That does not turn WiFi on or off. That shortcut simply disconnects the phone from the WiFi network it's connected to. That was the point I was trying to make with the article I linked to.
Go to Settings>WiFi and turn it to off. It will not turn on again until you go to Settings>WiFi and turn it back on.