Is it possible for an ISP to identify what iOS app I use based on network traffic?
SPs monitor apps that one uses on iOS
monitoringNetwork
Related Solutions
No - it's not a good way to get that data.
I would have a look at some of the many MDM software packages to get your population data so you can plan. JAMF has a great reputation in that space for low cost of entry and high performing software.
Also - you could make a quick little app that simply reported in some basic stats. Your users will be clamoring for potential apps and those willing to run that app will feed you with the data needed.
You will find that making the app forces you to restrict many of the new features and in reality - you'll have to actively work to get 3.x support in a project you start today using the current Xcode 4. 4.0 will be easy and only the new 5.0 features will get you into having to test the levels and have two sets of code for different generations of device.
Your development will drive what devices people use and not the other way around. It's almost always cheaper to just upgrade devices than pay developers to keep the older code tested and running.
There are lots of great charts out showing what some devs are seeing for how fast people upgrade to the latest iOS versions.
The most full featured way to peek into web traffic is to install and configure your system to use a web proxy.
The mitmproxy proxy (and mitmdump tool) is mature, reliable and well documented so I would start there unless you have another that meets your specific needs.
Also, widely used, superbly documented and well regarded is Charles Proxy
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Best Answer
Your ISP would be able to see what servers the app is connecting to, so most likely yes. If you wouldn't like this to be possible, you can use a VPN to reroute your connection through other computers and make it harder to trace.