Cant connect to WLAN?

After installing IOS 4.0.2 on my iPhone cannot connect to WLAN anymore. Mostly it dont fint any WLAN's at all. Sometimes i can find a network, but when I try to connect I cant. No matter if it is an open WLAN or encrypted.
Is this a known problem with this upgrade?

I have found the cover over the sim card slot is a little fiddly to insert into the slot. Can you connect to your network operator (gsm or 3g)  or does the phone stay in offline mode. A little more info would help.

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