If you already have OCN voice SIM card,

***050Plus service is already included.

*** Please check a small post card from OCN sent by mail.

***If you lost that post card,call OCN customer's front (Call center)

***0120-506-506 press 8 (English) 

If you have just Data SIM,

***Call OCN customer's front then get a post card from OCN.

***0120-506-506 press 8 (English)