Communicating between electronic devices involves sending messages between the electronic devices. An original message having an original source indicator and an intended destination indicator identified is sent. A reply to that original message is sent by the recipient of the original message. The reply message has a reply source indicator and a reply destination indicator. A communication based on the reply message is sent. The communication based on the reply message has a reply source indicator that is the same as the intended destination indicator identified by the sender of the original message. In one example, a message is sent from computer operating an instant messaging program and forwarded to a mobile telephone. The reply sent from the mobile telephone is provided to the sender of the original message without revealing the telephone number of the mobile telephone to which the original instant message was forwarded.