Wireless routers and cordless landline-based phones can compete for the same radio bandwidth as each other, which can cause interference for both devices. In rare cases where the physical phone line is improperly shielded or damaged, Wi-Fi transmissions can interfere with the phone line. However, it is more likely that the wireless router is interrupting the radio communication between the phone unit and the transceiver base that connects to the phone line itself. Writer Bio
