She works at the fringe of 2 degrees cover, so her phone switches back and forth several times a day from 2 degrees to Vodafone. She often gets an "activating FaceTime will incur a charge" type message, but not 50 times a month.
She doesn't often use FaceTime, but does use it occasionally so doesn't want to disable it.
It's not a big cost, but is an annoyance that something is sneaking her txts without her knowledge. Any suggestions other than disable FaceTime or switch networks?