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Often, as I'm walking and using the internet, I'll walk by a Starbucks and my phone will auto-connect to attwifi (which is free, but requires that I open my browser and confirm). I lose internet access for a little while, for no good reason.

I could turn off auto-connecting to known Wi-Fi networks, but then I'm getting rid of a useful, bandwidth-saving feature.

Any ideas for ways to get the best of both worlds, auto-connecting only to Wi-Fi networks that don't require a captive portal to sign in?

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Turning auto-connect to free networks off not only gets you rid of a bandwidth-saving feature -- but at the same time of potential dangers (session hijacking and the like -- just google for DroidSheep to see what I mean). –  Izzy Jan 20 '13 at 1:34
    
Sure - I guess what I really want is to remember individual MACs (and check for ARP spoofing) rather than Network Names. –  AlexeyMK Jan 31 '13 at 6:12
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With individual APs this is easy: Turn off auto-detect of "free WiFi hotspots", and simply connect once to each you want to remember. To those your device will auto-connect then when in reach. Take a look at WeFi Pro - Automatic WiFi for how to figure out whether it's a "captive" or not. Does that go into the right direction? Let me know, so I can turn it into an answer with some more details. –  Izzy Jan 31 '13 at 7:38

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