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Hi and welcome to the community!
Hard to say for sure but this sounds like it may be a message from one of your installed apps and not the phone itself. Could you take a screenshot of it?
Thanks Richard, I never thought it could be an app. I'm not sure which one it could be though?
I can't remember seeing this message before but a Google search suggested it might be an app from the operator 3 called inTouch. Do you have this app?
No problem 
Please let me know if removing that app did help. Good to know in case i hear of it again.