mobile number not showing on pop up on calendar

When adding a new client, if a mobile number is entered in ‘telephone number’ box then it does not show on the pop up on the calendar - could it be that if there is only one number on the client card then this field is automatically filled with either home number or mobile etc

Hi team,
Thanks for the feedback.
I’ve passed this for the team to consider as an improvement in future.
Best,
Stefani