VISAKHAPATNAM: BSNL has proposed to transfer telephone numbers starting with 2535xxx to 2539xxx from Tuesday. Customers are requested to register the STD dynamic code once again on Tuesday. Here are the procedures for registering, locking and unlocking of the codes.

123 ABCD ABCD: For registering the secret codes choose a four-digit code of your choice, like ABCD, and listen for acceptance tone and disconnect. 124 ABCD 1: For locking STD facility, listen for acceptance tone and disconnect. 124 ABCD 0: For opening ISD facility, listen for acceptance tone, disconnect. 124 ABCD 3: For opening STD facility, listen for acceptance tone, disconnect. 124 ABCD 2: For locking group level out going, listen for acceptance code and disconnect. 124 ABCD 4: For locking total outgoing facility. 123 ABCD PQRS: For changing the secret code, like ABCD to PQRS. Listen for acceptance tone and disconnect. For further queries contact: 1991 or 2544177.