@Silver29 Thanks for posting, if you scroll to the bottom of the app you'll see a symbol made of three dots. Click the three dots click more and scroll down then click sign out. Post back and let me know how you get on.
Thanks for reply Neil, but having no luck. When I open the app I'm at page headed My Sim with all my info. Scrolling down does not come to 3 dots. There are 3 dots in the header, but they bring up choice of Settings which only shows "Reset the app?" and Help which gives FAQs, Troubleshooting etc. No option to sign out. Opening the My Account tab gives the same 3 dots at top right with same options. No sign of any Sign out.
@Silver29 Sorry I misread your post and those instructions I posted were for the MyBT app. There's no sign out option on the BT Mobile app, clicking the reset the app option will mean that you will have to sign in again the next time you use it.
Thanks for help, anyway, Neil. I looked at the 'reset' choice and decided not to use it. What did concern me was that the BT mobile app would be using memory all the time it was running. I assume it's not using data as well.