Can not type plus sign in telephone number

[W0ut]

I can not type a plus sign (+) in the middle of a number. For example **61+32123456**30#
At the beginning of a number (as international access code) it works.

These **61 are 'command' codes used by mobile operators and can be very handy to setup voicemail, forwarding, etc.
But my Windows Phone 10 (Lumia 950) does not type the + sign. I can hold the '0' as look as I want. When not at the beginning of a number it keeps returning a '0'.

Any idea's?

 

[slyronit]

I can't test this right now, but for common codes, can't you create a contact in the people hub with such a number and just tap that to execute the code?