I use my wife's old Apple phone. Why do I get a text message when my wife has an intravenous drip?

Because Didi Chuxing is bound to the old mobile phone number.

Your wife may have forgotten to untie her old mobile phone number.

You can also be an emergency contact. After adding an emergency contact in Didi Chuxing, the added mobile phone number will be notified by SMS to ensure that it becomes an emergency contact of others. When using Didi to travel, after pressing the "one-button alarm" button, the related emergency contact phone will receive the message sent by Didi, mainly including the license plate number, vehicle model and location.