ZenMD will not work on your smart phone if your notifications are not allowed for ZenMD.
When you open ZenMD for the first time, yo will be prompted to allow notifications. The doctors call will be coming through the ZenMD app, so if your notifications are turned off, the doctor will not have a way to contact you.
your iPhone/iPad notifications settings for ZenMD should like like the image below. To access these settings click on your apple settings and scroll down until you see ZenMD on the lower left hand side.
Click Notifications, setting should look like the ones below.
*If you are having trouble allowing notifications, delete the ZenMD app then download and open again.
You will immediately be asked to allow notifications from ZenMD.