Make a phone number a hyperlink on mobile
Its a really great feature of mobile browsers now that you can just touch a phone number and your device will start to call it. Mobile Menu Customizer is totally compatable with this.
On most mobile devices, the link will be automatically created when it finds a phone number. This is certainly the case with iOS and most android devices.
You won't be able to test this from a normal browser though as it's the handset software that does it - so you'll need to test on a mobile device!