[iacvlvs]

"Leave a missed call" was so popular in South Africa that the networks implemented "Send a call me", where you send a GSM code with the target person's phone number and the network sends that person an sms message from your number with the text "please call me", your number, and an advertisement. Normally sending messages attracts a charge per SMS but a "please call me" is free, advertiser supported and limited in how many one can send per day.