help or advise

I've retro fitted some genuine CLK Xenon headlights to my 209. With just the ignition on all works fine, Had everything on to test. Turn the engine on (running) and the dipped beams both flicker and switch off. I have swapped the bulbs out with some spares I had and still exactly the same. if...

What model phone works in my 2004 CLK 270 CDI ?. Is it as simple as buying a phone of that era, plug in and that`s it ? Thanks, Reggie