What does the unknown icon on the Doro 8030 mean?

My doro8030 has an icon appeared at the very top near wifi symbol that i dont recognise or find in the manual. Its like a box with a handle from the left like a shepherds crook. The box has a minus sign in it. What is it and how do i get rid of it?

Hi Andrew, did you solve this one?

I have the same

Kind regards 

Hi Andrew. Can you take a screenshot or photo of it so we can have a better chance of identifying it?

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