[AlchemistCamp]

I don't know what your service is but I simply wouldn't be able to use it as my only phone number is Google Voice.

It's highly likely that prospective users just leave when encountering your restrictions and having their phone numbers rejected.

[DaiPlusPlus]

It’s a B2B service (“B2SB”?) - not targeting people/consumers - so it’s reasonable to assume they have a real phone number.

[JumpCrisscross]

> it’s reasonable to assume they have a real phone number

Just an anecdote, but I rarely give out my non-Google Voice number on sign-up forms. I don’t want my mobile in a database to be spammed.

If a phone number is required on sign-up, and my Google Voice doesn’t work, I usually pass. Whether for personal or commercial use.

[AlchemistCamp]

I run a business. Why is it reasonable to assume the use of legacy phone numbers?

[DaiPlusPlus]

We target a particular subset of retail-customer businesses which all generally have a phone-number.

[driverdan]

It's not reasonable. Voice is the only phone number I use and I use B2B services. If you prevented me from signing up I'd go to a competitor.

[erik_seaberg]

Which mobile carriers do you support, if not Google Fi (which is mine)? Or only landlines (which barely exist at my day job)?

[theelous3]

My last position was for a b2b voip telephony replacement type of deal. It would be trivial to load up on real geographic numbers from anywhere in the world and automate it all for bots.