If (you're into microoptimizing things and) all you care about is whether they're mobile, you can leave out `Type=caller-name` to save a whole one cent per look

If (you're into microoptimizing things and) all you care about is whether they're mobile, you can leave out `Type=caller-name` to save a whole one cent per lookup :) And if you're doing this before you try to SMS them, you can skip the lookup entirely, if it's a landline you'll just get an error back. (I work at a company that uses Twilio heavily and it's full of this sort of microoptimization)