A friend of mine with an iPhone 6 with iOS 11 says that when she is in a phone call and then wants to switch to the speaker (on the phone) and taps the speaker icon the phone sometimes switches immediately to the speaker and sometimes gives her three options to choose from: 1.) iPhone, 2.) Speaker, 3.) MacBook. She then has to tap a second time onto "Speaker" to activate the iPhone speaker. She does not want to have the three options ever; she always wants to switch straight to the iPhone speaker. How can the "three options option" be disabled?