What do you use for user verification?

I don't have a cell phone that can receive SMS but I do have Skype. I live in a cell phone dead spot and spend a lot of time on the highways of Upstate NY which has cell phone dead spots in it larger than some European countries.

If I need to make a phone call or look something up I stop at a gas station which always has WiFi. Both intercity and city buses have WiFi. NYC subway has WiFiWhen I need to use the Ticketmaster app to get into a stadium I can use the WiFi at the stadium; I've managed to get my bags in and out of a LuggageHero even if it meant running two blocks to use the WiFi at a Starbucks.

One app I can't use is WhatsApp because it needs a carrier-tied SMS to verify. If you do the same you are locking me out as a user.