Wireless and 4G at once?

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I notice that on my SGS4G running Gingerbread, that if I enable wifi the 4G icon goes out, and if dig deeper ifconfig shows just the pdp0 mobile interface is replaced by the eth0 wireless interface.

A colleague of mine has a new SGSII also running Gingerbread and when he enables wireless he gets both the wireless icon and the 4G icon. ifconfig shows both the pdp0 and eth0 interfaces alive at once.

Any reason for the difference in behavior?

I only notice both at same time when download SMS.

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My wireless AP is going crazy at my house. Its custom and has some driver problem a Co-worker of mine is looking into.

What happens is the ssid still broadcast, but the AP doesn't pass traffic. On my phone I see the wifi icon and 4G when this happens. If I reset the AP so wifi works again (for another hour) the 4G icon disappears.

Maybe the sgs2 is able to connect, but not able to pass traffic. If you had a static build of netkit ping, it has an option to specify the interface to ping out.

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Actually, I think I remember koush saying something on g+ about udp not working over cell networks. Maybe im wrong. You could also use tcpdump.

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Lol, nevermind. Ping works.

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The 4G icon goes away because you would not need the 4G data service if you have a WiFi connection with an active internet connection. It is standard even not for 4G signal, it does that with edge, 3g, and HSPS. I believe it just leaves a standard GPRS connection open with the tower. All to save battery.