sudo iwlist wlan0 scan
[sudo] password for phablet: 
wlan0     Scan completed :
          Cell 01 - Address: xx:xx:xx:xx:xx:xx
                    ESSID:""
                    Frequency:2.462 GHz (Channel 11)
                    Mode:Managed
                    Signal level=-71 dBm  
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra:Rates (Mb/s): 1 2 5.5 11 6 9 12 18 24 36 48 54
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK

phablet@ubuntu-phablet:~$