[NoZebra120vClip]

I don't know what country you are in, but if you are concerned about a phone number and postal address, there are myriad ways to obtain both of those which can effectively obscure your location and identity.

  * Get a Google Voice or other VoIP provider.

  * Get a burner cell phone.

  * Get a business account with your PSTN provider and run an Asterisk PBX or something.

  * Obtain a PO Box at your US Postal Service, UPS Store, or an independent provider of boxes.

  * Identify a coworking space where you can receive postal mail, and use its address.

Since you are a business, (you are a business, or just an "indie developer"?) then you should be able to establish business-class accounts in this manner and satisfy Facebook's requirements. They do not seem overly onerous.

[santah]

Not in the US, but yeah, I may be able to get a phone and an address through some 3rd party service(s), but I'm not sure it's worth the overhead, especially if it's just to pass the verification (and potentially users would not be able to really get in touch through them).

[andrewfromx]

trying to use google voice SMS to verify 6 digit codes is like 50/50 shot. Some sites allow VoIP some don't. Without getting a full burner cell phone, is there a service that lets me get a REAL SMS number?

[NoZebra120vClip]

I don't understand your criteria. SMS is a cellular service. Do you want a mobile phone or not?

Also, you are not the OP. Does "Sign in with Facebook" require verifying TOTP codes? Never ever use SMS for TOTP. Register a real authenticator or Yubikey instead.