A telephone device may be configured to be connected with an access point capable of communicating wirelessly with a terminal device by using a specific bandwidth including a first bandwidth. The telephone device may comprise a first communication unit configured to communicate wirelessly with a call device by using the first bandwidth, and a second communication unit configured to communicate with the access point. The second communication unit may be configured to send, in a specific case where a specific wireless communication starts between the call device and the first communication unit, a first instruction to the access point such that the access point uses a bandwidth other than the first bandwidth.