My wife has an iPhone 6 Plus on 12.4.2 and an iWatch 3 wifi only. We only have one iPhone and the cost to add a 2nd iPhone is prohibitive. I have Afib and various health issues and the ECG, HR, fall detection and so on would be very useful to me. From what I have found - 2 iWatches can be paired with 1 iPhone but not active at the same time. If I were to set up a new watch on her iPhone and avoid connecting it once activated - what would work and not work etc... I greatly appreciate any insights someone could offer to this operation. I understand I could not message and call while not connected to her phone. My thought it to simply uses it as a smart wifi connected watch for music, health monitors, afib alert etc - Thank You for your consideration.