no permissions for adb devices on ubuntu 12.04

(1) find phone device id from output of lsusb command

Bus 002 Device 004: ID 0bb4:0cd6 High Tech Computer Corp

(2) replace 0bb4 and 0cd6 with the step one's result

echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="0bb4", ATTRS{idProduct}=="0cd6",MODE="0666"' | sudo tee /etc/udev/rules.d/70-android.rules

(3) restart udev service

sudo service udev restart

(4) unplug your phone cable, plug in again