Actually, no they couldn’t, assuming you’re talking about cell phones being the ground station. One, your cell phone doesn’t transmit with enough power to reach

Actually, no they couldn’t, assuming you’re talking about cell phones being the ground station. One, your cell phone doesn’t transmit with enough power to reach even a LEO satellite, and the existing protocols dictate a two way handshake. Second, what do you anticipate the phone to do with the data once it’s received?