-----Ursprüngliche Nachricht----- Von: Harald Welte <laforge@gnumonks.org>

Are you sure your other phones are using O2 in GSM mode, not 3G? It could be that the other phones use 3G and thus have better coverage indication.

Hi Harald, i have a pretty old nokia phone (6310) and it's only able to do GSM. That was used for my comparison.

...

Is it possible, that my provider does not like the random imei-feature of osmocom?

That might very well be, but is completley unrelated to a RF signal level as it is measured by your phone (which leads to the problem you are observing).

I'm gonna try to move closer to the BTS tomorrow and collect some informations. If the quality stays poor, i can only attach an additional antenna to the phone. Thank you. Stefan