inputs.text: works iphone 3g4 not 4s - audio adapter great way connect ipodiphone car stereo however two shortcomings first forehemost not work iphone 4s used since 3g iphone 4 upgraded 4s no longer works still works old iphone 3g 4 theory automatic switch alpine unit reason not detect 4s plugged repeat models iphoneipod work fine except iphone 4s second issue minor worth mentioning plug adapter phoneipod big use bumper case phone case must rehemoved plug inserted iphone overall loved using adapter listen tunes car pretty much stopped listening radio andor cds since play podcasts pandora entire music library iphone since got another model audio adapter manual switch iphone 4s works fine would give 5 stars worked 4s