In some embodiments, methods comprise: receiving a communication request from the IM client using a first server; delivering the received communication request to the mobile phone using the first server; recording information regarding the communication request; receiving a communication response from the mobile phone; associating the received response from the mobile phone with the communication request from the IM client based on the recorded information; and sending the received communication response to the IM client. In some embodiments, methods comprise: receiving a call from a mobile phone at a first server, wherein the call is made by dialing a number from the mobile phone, the number indicating that an IM client is an intended recipient of the call and identifying the IM client; sending a communication request to the IM client based on the received call using the first server.