I’ve been contracted with OCN Hikari for a while, but recently I also switched my mobile to OCN Mobile, so I googled how to integrate the OCN customer numbers issued at that time. I’ll write it down here for reference.
First, log in to OCN My Page with the OCN ID you’ve been using (in this case, the OCN customer number you contracted with OCN Hikari).
Go to Payment → Other Procedures / Information.
Next, go to Check Contract Status.
Then, go to Register Contracted Services to My Page.
Next, go to OCN.
Then, go to Add Registration.
Once you’ve done this, just register the OCN customer number you want to integrate. The authentication process is a bit of a hassle, but once you get here, you can proceed without much trouble.
As always, the site design makes it hard to find things, but considering the stable prices for fiber internet and cheap SIMs, I think I’ll stick with OCN for a while.