Is anyone familiar with Vonage and their Nexno platform? They have a Verify product that is 2FA and boasts their 2FA is patented. I have not seen them on any list of infringers thus far.
20 Billion verifications to date..... only $0.0350 per successful verification.
https://www.nexmo.com/products/verify
"What I am is the show stopper", "The best there is, the best there was and the best there ever will be."