Best Practices for Developing Cellular Apps: https://developer.apple.com/library/ios/documentation/Performance/Conceptual/CellularBestPractices/BestPractices/B

Best Practices for Developing Cellular Apps: https://developer.apple.com/library/ios/documentation/Performance/Conceptual/CellularBestPractices/BestPractices/BestPractices.html https://developer.apple.com/library/ios/documentation/Perfor... Each of the network interfaces have different identifiers and you can get info about them. Also maybe helpful, many of the apple BSD utilities have a `-C` and `-E` options to prevent binding to a cellular or "expensive" interfaces. For example, `netcat` has this, and is open sourced (part of Darwin), so you can poke around and see how they do it. http://www.opensource.apple.com/source/netcat/netcat-22/netcat.c http://www.opensource.apple.com/source/netcat/netcat-22/netc... (By the way, just bought the app - happy to pay $5 for this.. Good luck!)