How to disable / deactivate caller tunes on MTN, GLO, Airtel and Etisalat

How to disable / deactivate caller tunes on MTN, GLO, Airtel and Etisalat Egwu_master GLO
To deactivate your caller tune on glo network at any point in time, send text
“dereg” to 7728 and service will be withdrawn without any charges. Or dial 7728 and follow the voice prompt.MTN
Simply text the short code "Cancel" to 4100. After sending, you'll receive a message notifying you that you've successfully canceled your MTN callertunez account.AIRTEL
Simply text the short code "Stop" to 791.

ETISALAT
Simply text the short code "RBTOFF" to 251.

http://9jaboombox.com/disable-deactivate-caller-tunes-mtn-glo-airtel-etisalat/