To hide the mobile number you will need to follow the below steps:
1. Log into your account via www.nhs.net
2. Click Profile in the navigation bar at the top of the screen
3. Click on My Profile tab
4. If you wish to hide a personal mobile number from being displayed in the NHS Directory click the ‘Hide mobile number from address book’ option
5. Click Next
To unhide the mobile number:
Follow the steps 1-3 as mentioned above
1. Untick the ‘Hide mobile number from address book’ option
2. Click Next