source https://bsnlteleservices.com/bsnl-call-waiting/
Activate BSNL Call Waiting to Receive Mobile Call Alert When Busy
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December 09, 2019
December 09, 2019
How to activate call waiting in BSNL SIM card, Is there any activation number or dial codes, and the charges for mobile call waiting facility, Is the facility deactivated, when call forwarding...
source https://bsnlteleservices.com/bsnl-call-waiting/
source https://bsnlteleservices.com/bsnl-call-waiting/
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