Call Router

Call Router optionally adds a prefix and a suffix to any number dialed from Contacts, the dialer or other methods. Any number of prefix and suffix profiles can be configured. They are presented to the user in a dialog box when he makes a call using Contacts, the manual dialer or other call placing features of the OS. The option to dial the number without modification is also shown.

One usage is to make cheap international calls using a DISA system. For a full explanation, see:

http://blog.mbah.org/2012/06/20/callrouter-cheap-long-distance-calls-on-a-cell-phone/