2015 EX / iPhone 7 Plus BT - receive text but it does not show sender's number
 

Hello,

Phone is paired fine, I can listen to music via BT, I can make and receive calls, I even receive texts.
However, the number of person who send the text does not show on the screen (see pic below - you can see the space next to the phone icon underneath date/time is blank. This is where the sender's name or number should appear in the notification).

I tried with Android and in Android the sender's number appears fine.

Any idea?