Question: How can I activate or deactivate BSNL services like caller tunes, DND, etc.?
Answer: Caller Tunes: To activate BSNL Tunes, dial *567# or send an SMS with the keyword ""BT ACT"" to 56700. To deactivate, send ""UNSUB"" to 56700.
DND (Do Not Disturb): To activate DND, send ""START DND"" to 1909. You can also deactivate it by sending ""STOP DND"" to 1909.