For all you guys out there who have this problem I have submitted this case to HP:

Case ID: 1212369985

Submitted: 2006-08-12 07:52:15 GMT+02:00

Problem description :
This seems like a universal problem because I hear this from
many people over the Internet Forums everywhere. I have both
H6365 and H6315 in my company. The problem with the 6315 is
that after SR the WiFi is on but the WiFi Settings don't show
the Wireless TAB, only the Network Adaptors TAB shows. In this
situation it is not possible to turn WiFi off. This also locks
the phone and makes it extremely slow after 20-30 seconds of
use. In fact it is impossible to use the device this way. When
the device comes up this way the connectivity icon shows G for
the GPRS service and the WiFi antenna is not there. Also on the
iPAQ Wireless program the WiFi button is brown and the WiFi LED
blinks orange. It is impossible to turn WiFi off in this
situation.
People all over have tried a million solutions but I personally
think it's a software bug. I was able to tease the device with
numerous SR's, sometimes after a SR the device comes back with
the connectivity icon showing the WiFi antenna and then it is
possible to turn the WiFi OFF. A self test on the WiFi only
sometimes works too and jogs something internally that makes
the device show it's WiFi Wireless TAB and then it is possible
to turn the WiFi off.
I think it's time for HP to do something about this for its
H6315 users and maybe for other 63XX users who encounter this
problem. Please take care of this.

__________________
Bary.