I now assigned a static policy (blocked for all iPhone devices), going through Wireless => Configure => Access Control. I turned wifi on/off on my iphone, I renewed IP address lease on the device, closed all applications/sessions, but still the iPhone has access to web applications on that SSID... So the policy (block all iphone) does not seem to have been applied. I must say that with renewing the IP lease, the same IP address is assigned, but I guess that is not a reason why the policy should not apply.
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