Across Africa, the practice of 'beeping' is spreading fast. This involves calling a friend or contact on his/her mobile phone but hanging up immediately. The friend gets a missed call and returns it - and he/she incurs the call cost and not you!
The phone companies are working out ways in which they can get (small amounts of) revenue from these 'missed calls' and are introducing new 'call me back' services.
So both parties are trying to maximise their value and minimise their costs .... quite productive, really.
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