To hear live Buffalo Bills gameday broadcasts on your iPhone, iPad or iPod Touch download the TuneIn radio app. Then find the Buffalo Bills local radio station live streaming feeds of the games. With the TuneIn app you should be able to listen to pre and post game audio, as well as catch other games around the NFL.
Buffalo Bills Mobile - iPhone App (You can stream WGR 550 and listen to John Murphy Show podcast).
WGR Sports Radio 550-AM iPhone App (Flagship station)
For Bills Radio Network Stations see: Listen to Buffalo Bills Radio