Use Mobile Number Portability
Send SMS to 1900 as <PORT><Space><10 digit mobile number>
e.g. PORT XXXXXXXXXX
Contact nearest BSNL Customer Service Centre along with Unique Porting Code (UPC) for porting to BSNL
Use Mobile Number Portability
Send SMS to 1900 as <PORT><Space><10 digit mobile number>
e.g. PORT XXXXXXXXXX
Contact nearest BSNL Customer Service Centre along with Unique Porting Code (UPC) for porting to BSNL