does app give different device token on re-installing again

Question

I remember, the device token never changes upon re-installing for iPhone.

However these days (especially on iOS 9), I noticed that device token is changing if I re-install the app.

Is this setting is done by Apple or I am missing anything?

I have to know this because this is very important for me as I am sending push based for specific users to inform their updates.

Also for no reason there are un-wanted many device tokens.

Note

I am calling below webservice in App Delegate

- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken
{
    // sending it to online database for my record
}

Answer 1

Yes on iOS9 Apple says that Device Token might change each time your app is installed. So the best way is to reregister the Device token on each launch.

Here is a link to Apples documentation about changing device token