There are some devices that are not currently being developed and notified by push notifications, notification centers.
The following are the conditions tested, but it is helpful if you can tell me the possible causes.
Even if you can not conclude, it is fine as a possible cause as a possibility.
Mechanism of notification
① User sets time
② Notify the silent push
③ Access the server from the application side to obtain update information
④ Push notification, update information displayed to notification center
About notification
At the time of application start (foreground)
Iphone 6 ◯
Iphone 6 - 2 ◯
Iphone 6-3 ◯
Iphone 6s ◯
Iphone 7 ×
Iphone 7 ×
Application end (background)
Iphone 6 ◯
Iphone 6 - 2 x
Iphone 6-3 ×
Iphone 6s ◯
Iphone 7 ×
Iphone 7 ×
Iphone sleep (background)
Iphone 6 ◯
Iphone 6 - 2 x
Iphone 6-3 ×
Iphone 6s ◯
Iphone 7 ×
Iphone 7 ×
◯ is receivable × can not be received
version
Iphone 6 10.3.1
Iphone 6 - 2 10.3.1
Iphone 6-3 10.2.1
Iphone 6s 10.3.1
Iphone 7 10.3.1
Iphone 7 10.3.1
Other conditions
All notification settings are on
Install from testflight
Install on a total of 6 units
Three iPhone 6
Results are the same for 4G line and wifi environment