> There is 4096 bit support with Yubikey 4 which unfortunately isn't offered with NFC. Yes, but OTG adapters work pretty well here or one can use Yubikey 4C if

> There is 4096 bit support with Yubikey 4 which unfortunately isn't offered with NFC. Yes, but OTG adapters work pretty well here or one can use Yubikey 4C if the phone has USB-C input.