I am trying to figure out an easy way to get calls from my work to my mobile phone on days I am out of office. NTT seems to offer a service for 800jpy a month extra, but honestly NTT is already like 2500 a month just for the landline, so I am thinking about just changing completely. An MNVO cell phone plan would be cheaper than that honestly and I could just take the phone home with me when I plan on being out of office.
I just worry about if I would have to change phone numbers for the business, if they had some sort of MNP system like they do for cell phones that would be nice.