Far far more people have a biometric reader or smart token than have a cell phone.
Smart phones are obviously phones and have biometrics. What you're left with is comparing the number of people with non-smart phones (~31 million in the U.S.) to the number of people without smartphones but who have biometric tablets, Windows Hello-enabled computers, PIV cards, etc.
Smart phones are obviously phones and have biometrics. What you're left with is comparing the number of people with non-smart phones (~31 million in the U.S.) to the number of people without smartphones but who have biometric tablets, Windows Hello-enabled computers, PIV cards, etc.