Phone credit low? Africans go for "beeping"
usabilitynews.com
usabilitynews.com
I remember a TV commercial that involved this a few years ago. Oddly enough, I think it was for a phone company.
One of the cellphone providers would also give you a code *147 or something and someone's number and it would send a "please call me" text message with your number included. People would say. Send me a "please call me" when you are there...
Everyone does it.
Funnily enough, a missed call probably conveys just about as much meaning as the average text message.
Though it originated as a way to save money especially for pre-paid mobile users, it has come to mean a whole lot of things now. ie. if you are to meet someone for coffee and he hasn't shown up yet, instead of calling you give him a missed call so he knows you're waiting.