When you sign up for Another Number we place 2 contacts in your iPhone contacts there are:
'Another Number Incoming Call' and 'Another Number Outgoing Call'.
The Another Number Incoming Call contact works by being the contact that all your Another Number calls go through. When some calls your Another Number our server takes the call and forwards it to you via this contact. You can therefore see the correct contact name calling 'via Another Number'.
The Another Number Outgoing Call contact is responsible for handling the calls that you make from Another Number. When the call hits our server it detects what number you are calling and makes the connection.