yes. I didn't look carefully enough. I connected both LED's, GND and Vin pin.. also the button via 20k resistor. LED 0 (blue) blinks constantly, when I click the button (hold 2sec) then it turns off and LED 1(red) lights up for a few seconds and then they both turn off... probably this means the device is switched off. when I press the button again, blue LED starts blinking.
still my phone does not find the device...
edit: yes, all grounds are connected together