wi fi - Windows laptop works with Wi-Fi AP, phone claims it is connected but can't access Internet

There's an Asus 240 MIMO Wifi access point. There's a laptop running Windows XP that uses that access point no problem for years so far. And there's an Android based HTC Desire S smartphone that has problems. The objective is to make the smartphone access the Internet via the Wifi access point.

I open "wireless networks" configuration pane, "enable" Wifi - it goes through "scanning" and "obtaining IP address" stages, says "connected to TheRightNetworkName". The Wifi symbol is displayed in the bar under the top of the screen. Yet when I try to open any page in a browser if wouldn't do so and claim there were problems accessing that page.

I tried the following (listed in this answer below, thanks to user Matthew Read):

• rebooted the phone - doesn't help


• checked MAC filtering on the AP - it is disabled


• disabled the firewall on the AP - doesn't help


• tried to change channels - doesn't help, the AP has 13 channels if that matters



• tried to change to 2.4 GHz - looks like it is already the only option, couldn't find any way to change the range


• didn't try to switch from WPA that is currently used to WEP because it feels quite scary - I can mess things up


• tried switching modes - b, g, b/g - doesn't help

How do I debug and resolve this issue?