Technically possible, practically unlikely (you iOS phone would be a terrible router, giving the people who made the calculator app a slow, unreliable output node that would identify to the desired source as a lower-quality (mobile) client. In other words, it would be a bunch of extra work and risk for a worse result.

The theoretical model here is using people’s fast, stable (-ish) broadband connections to relay the connection. Even then, it’s only for the initial setup steps; once you get to the actual streaming data, nobody in this model wants to ferry those packets around.