From the very beginning of the Afghanistan Interim Government, one of the flourishing industry in the country has been the Global System for Mobile Communications (GSM) technology, since after a few decades of war in Afghanistan, there was no possibility to establish other means of telecommunication, regarding infrastructures and so on.
Etisalat Afghanistan, a U.A.E.-based telecommunication corporation, is one of these providers of GSM technology. In May 2006, it signed an agreement with Afghan authorities in Abu Dhabi, U.A.E. to operate a GSM network across Afghanistan and become the fourth GSM operator in the country. The company is completely owned by Etisalat U.A.E. and it's the "sixth largest company in the Middle East".
One of the services the company provides, in Afghanistan, is CRBT, or Coloring Ring Back Tone, which provides "your caller with your favorite songs, before you pick up the phone [...] instead of the dial tone".
To activate the service, one having the Etisalat SIM card must subscribe to the service which it charges 100.00 afs. The other charges for the maintaining the service include Rental Charges and Usage Charges, for selection or changing the ring tone, you would like your caller to have a good moment with while calling you by listening that.
The problem exactly is hear. Imagine the case when somebody, for instance, an important person, was calling you, what would he/she be thinking about you, then?! That's good, to some extend, using it among your friends, but I don't think it could be so appropriate for official use-- the CRBT and the Etisalat SIM card then. OK, this is definitely MY taste, as a potential customer for Etisalat. What do you think?
Being funny (!), it could have another use: using it to shock your callers!