Stop using caller tune / songs

In the holy month of Ramadan,
Stop using caller tune / songs

Zong: Write "UNR", send to 230
Telenor: Write "UNSUB", send to 230
Mobilink: Write "UNSUB", send to 230
ufone: Write "UNSUB", send to 666
Warid: Write "RBT OFF", send to 7171