I set up a custom (m4r) ringtone for my contact on my wife's iPhone 5 (iOS6). However, when I call, the phone plays her default ringtone (not Marimba, but another one she has set as her default). I'm confused why when I go into her contact list it clearly shows the ringtone that is associated with my contact information, but the phone instead plays the default ringtone when I call. Any suggestions as to a cause/fix? Thanks, J.