You can make sure your phone number won't be shown to the person you're calling by changing your phone settings. Find out how to change your caller identity settings
To hide your number for one call, enter 141 before the number you're calling.
If you've hidden your caller identity, enter 1470 before the number to show it for that call.
If you want to hide your number for an international call, enter 00 instead of + before the number you're calling.