This story is heard from one of my (old age / senior) friend that happened in real that too a decade ago when the mobile revolution was in a starting phase. The story roughly writing by me and goes like this. A couple who married a few years ago was in a dilemma about doubting each other for nothing though they loved each other. If a husband goes out of home for regular business then he has to call his wife or vice-versa within ten to fifteen minutes or else something strange shouts and argues between them. One of them again have to call within thirty minutes to less than an hour after the first call. It shall continue for the whole day till he reaches the home at whatever time.
The calls were going on every half an hour between them which helped the mobile service provider too. The problem with this person was he has to operate or dial the contact number manually remembering his wife number or he has to take the small pocket book and use his wife number to dial. Those days mobile handset and operating method was little different (between each brand) than at present that comes with (uniform for all brands) touch devices or mobile friendly usage which even a child can easily understand and operate it.