airtel missed call alert (MCA) - Activation / Stop Process

airtel Missed Call Alert (MCA) service Monthly Fee is 11.50tk ( with VAT)

service details/conditions:
How to activate/ deactivate ?
• to activate : dial *121*2*4#
• to deactivate : dial *121*3*4#
• sms charge : free for activate/deactivate
• this offer will continue till further notice.