We use 2504 WLC. Attached are the AIR-CAP-1602 Acces Points. We secured all our WLAN networks with WPA/WPA2 and PSK. We're able to connect to these WLAN's with a Nokia Lumia or Sony Xperia J/S. When we try to connect with a HUAWEI or Iphone5 the phone keeps "connecting" or "getting IP".