Parent company forcing unique phone numbers for account creation. Any easy workaround?

Hi all,

The parent company for our business, who we have accounts with for each employee, are now enforcing a rule that every new account created required to have a unique phone number to create the profile. Previously we've just been using the company number. I think the reason behind it is future use of SMS for 2FA but currently it serves no real purpose.

Our company has a rule that we do not expect our employees to have or use their personal devices for work and so we have to provide them. The most obvious solution is to purchase ~30 new phones, sim cards and phone plans just so we are able to make accounts?

There must be an easier solution? Ideally we'd have some cheap option for mass purchasing phone numbers that only serve to forward to a centralized real phone or something similar? Everything seems unaffordable and unrealistic?