I noticed that during the call both min and max are set to 600Mhz (using console via ssh).
after the call the minimum is reset to 250MHz.
can someone confirm that during extended phonecalls, even with the stock kernel,
scaling_min_freq, scaling_max_freq and scaling_cur_freq are 600000?

it would mean that Nokia keeps your device at the dangerous 600MHz during an entire extended phone call!
Calling is overclocking!