As you can see – installing an app with PUSH will *always* register the device with the app developer’s push server.  Until the user uninstalls this app, or until they go off-network for quite some time, the push notification server will assume the device is active.  It is only after many days of no response (no network at all) or removing the app that Apple’s servers will notify the developer’s servers that the Push identifier for that device is invalid.  So, when the developer pushes something to that device ID for that app, their server will connect to the Apple Push notification servers and submit the push notification payload.  The Apple servers will process the payload and will then send the push to the device specified by the unique device identifier.  It is only at the final endpoint where the push notification will be displayed or ignored depending on the user’s setting on the device.

In other words, if you have 20 apps installed on your phone that all support push notifications, and the only way to configure those notifications is by Apple’s built-in push notification settings control panel, even if you have them all disabled for push – your phone or pad is still receiving the push notification payload – it’s just not showing it to you.  In other words, yes, you are burning data even though it’s not benefitting you.  Like I mentioned, some apps (like facebook) allow you to configure push notifications INSIDE the app – this is different.  In most of these cases, the developer of the app is recording that you don’t want to receive the notification, and they do NOT send the notification to Apple’s servers unless you go back into the app and enable push.  Most apps, however, do not work this way.

At first this may seem nonsensical, but in reality, it makes perfect sense.  Especially when you use devices like the iPod Touch which don’t have an always on internet connection, this gives you the ability to change these settings in the device control panel at will, whether on-line or off-line, and your wishes will be granted.  it provides a happy medium where your users have access to use a great service, but the developers don’t have tons of code to implement opt-in/opt-out settings, need to worry about checking for changes since the last launch before sending a push, or the need to create complicated bi-directional communication paths between Apple, the developer, and the devices which are constantly banging on the network and the device.

As described in the Apple Push Notification Programming Guide, push notifications have a maximum payload of 256 bytes which is very small – so with an app that doesn’t blast you with notifications, this shouldn’t be an issue.  Now, because the payload is what the developer is sending you – let’s assume that there is a 10% overhead of other binary data

that “packages” the push payload.  So given this – we will assume a notification size of 282 bytes.

Now, the lawsuit appears to cite a sample where a phone accumulated 2,292kb of data usage over a 10 day period “without being touched”.  Assuming this is true, and using the law of averages – that’s 229.2kb of data per day.  229.2kb of data comes out to around 29,338 bytes.  Assuming the max push payload size of 282 bytes, this equates to around 104 push notifications per day.  Now – this sounds rediculous – but if you have a bunch of apps like Mashable, ESPN, Twitter, CNN, and others on your phone – this isn’t out of the ordinary.

Combine this with the fact that this is data being received by pushes that were thought to be “disabled” – it becomes easy to imagine how one could receive this many notifications.  Let’s say for example you have 26 apps on your phone, you have push enabled on four or five of them – but on the rest, push is disabled.   All that would have to happen is for each app to send you four notifications per day and you’ve hit your 104 target.  Given that it’s even more common nowdays for people to have upwards of 100 apps on their phone, it’s easy to see how significant amounts of data could be consumed even if you’re not “receiving” (read: viewing) the push notifications.

Now, This is based upon my understanding of how push works – and what I have witnessed through my own apps.  All I know is that I send pushes to all devices whether push is enabled or not.  My assumption is that Apple does not do any further filtering on these notifications – your device does.   Given the technical challenges of supporting a notification system that must deliver the best service possible through online/offline scenarios, this is also perfectly logical and IMHO, the system is very well designed.

The other flaw in this suit is that it completely discredits the fact that these are basically computers.  If you are on a limited data plan on a cellular card for a normal laptop computer, and you leave it sit for 10 days, connected, in your laptop but never “use” the laptop – I’m sure you’d be surprised at the amount of data the computer consumes just sitting idle – even if you are not using it.  Computers are constantly communicating on a network if it’s available, regardless of whether you are actively using the connection – it’s a side effect of being connected and desiring that “always on” connection expected today.  Renewing DHCP leases, communicating with DHCP servers, responding to network ACKs or pings – all of this stuff consumes data with no apparent benefit to you – but it’s required…. deal with it.

If the people filing this suit had half a brain, they would have turned WiFi on and used a network analysis tool to figure out how much data the device consumes when sitting idle over WiFi.  The device doesn’t discriminate – it will keep a network connection active whether it’s WiFi or Cellular – so analyzing the WiFi vs. Celluar traffic should yield consistent results given the same scenarios.  This would be easy enough to do by dropping a halfway decent managed switch in front of a wireless access point, and then observing the network traffic to/from the iPhone/iPad using any common network analyzer.

I’m willing to bet given this scenario, they also would have seen 2,292kb of network usage over the same 10 day period given, and they could have actually SEEN the contents of the traffic.  I’m willing to bet that it was composed of network maintenance/queries/responses and push notifications they thought were disabled.  In the end, however, I doubt very seriously it’s AT&T billing them “for the hell of it”.  I’d like to see them perform the same test by taking a newly activated iPhone, with no third party apps installed, and let it sit over 10 days.  I’m betting it still uses data, just not as much.

Just my .02.

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