unfortunately it only works with telegram. i would love a service like this for all social media accounts! got friends who were simswapped and had their lives ruined by teenagers who wanted to flip short instagram + twitter handles for profit. sending out nudes to their families from cached snapchat photos... 😔
i believe this is how it works: they are routing +888 toll numbers through their own infra to accept calls from the telegram 2FA service and then securely send you a login code after authenticating with your wallet. the numbers are NFTs on the TON blockchain.