No r-gsm cell shown in mobile app

Hi, I'm thinking about why the mobile app don't show me the German GSM-R (MCC: 262, MNC: 10) cells they are around me. The rssi app shows me the cells (e. g. ARFCN: 957 and 961). I'm using the sylvain/testing branch and I am searching for more details in the source code and found in settings.c that the r gsm band are enabled and in the freq_list. Can someone tell me another point for searching in source? Thanks in advance. Best regards.  kasio