In some implementations, a request to switch to using a second network connection is received at a first computing device that is currently communicating with a second computing device over a first network connection. While still using the first network connection, the second network connection may be initiated. During a period of transition, the first computing device may communicate with the second computing device using both the first network connection and the second network connection. To use both the first and second network connections, data from the second computing device may be received over the first network connection, and data may be sent to the second computing device over the second network connection. The first computing device may identify an end of the period of transition. In response, the first computing device may communicate with the second computing device using only the second network connection.