The FFIEC urges institutions to evaluate the strategic risks posed by the wireless delivery channel. Standards for wireless communication are still evolving, creating considerable uncertainty regarding the scalability of existing wireless products. Wireless financial transactions increase the potential for unauthorized use due to the limited availability of authentication controls on wireless devices and higher likelihood that the device may be lost or stolen. Wireless network security should focus on securing systems throughout the transmission process, from the wireless device to the institution’s systems and back again. This is often called the “gap-in-WAP””]
Source: https://www.cuinfosecurity.com/biometrics-voice-verification-overview-a-397