Question

Once created does the push notification device token ever change?

Example when the app is updated? or in any other case it can change??

Answer 1

From [Apple Documentation ApplePushService]2

The form of this phase of token trust ensures that only APNs generates
the token which it will later honor, and it can assure itself that a
token handed to it by a device is the same token that it previously
provisioned for that particular device—and only for that device.

If the user restores backup data to a new device or reinstalls the
operating system, the device token changes.