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On the other hand putting things on the server means that you can get cut (by IP) and also brings the need of dealing with scaling problems.

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You can always scale easier on the server platform, as well as spin up new instances with new IPs on any VM platform.

Handling it on the server allows you some control over the chaos. Not so much when all the logic is on your mobile app.

You aren't suggesting that it scales easier on the server than on the mobile client, are you? Nothing would scale better for this app than putting the logic on the client -- it's a customer's phone communication with an Apple server. This leaves nothing for him to scale, anywhere, except for engineering to push out updates.

I wouldn't say you're scaling properly if you have millions of mobile clients failing to make the proper calls to a service because the protocol has been changed. I'd say its damn near irresponsible to do that. It's not scaling if you're just throwing packets against the wall when the protocol or service unexpectedly changes.

The impression I got was that actual requests and responses are still made by the client.

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