Phonenumer doesn't match even if correct

[ki2007]

There is no way for me to enter the phonenumber without the panel thinking that it is a mismatch.

The problem seems to come from the "+" which is entered in the number template

but the problem is, if I omit the "+" in the numberformat I still can not put it manually in the number field.
Then the mismatch is still the missing + at the beginning.

What I believe should happen is that the fixed numbers and symbols from the numberformat (for example +) should be added to the entered number and the complete sting should be matched against the string send from the app.