Safe Number Personal Phone NumberA Safe Number is a safe call personal phone number that people can dial to reach you on your normal phone numbers - landline or mobile, without you having to give these out to people you don't really know or necessarily trust. Safe Numbers start 070 and look similar to mobile numbers - e.g. 07012 906000.You can still use your existing phone numbers exactly as before and you don't need to change anything. You'll know when someone has called your Safe Number because there will be a brief message before the caller is transferred.