Hi Renat, On 04/20/2014 03:55 PM, r.r.zaripov wrote: > ofonod[9917]: drivers/atmodem/cbs.c:at_cbs_set_topics() > ofonod[9917]: PCUI: > AT+CSCB=0\r > ofonod[9917]: PCUI: < \r\n+CMS ERROR: 302\r\n > ofonod[9917]: PCUI: > > AT+CSCB=0,"0-1,3,5,7,11,13,43,130,333,500,555,666,900,4096,4097,4098,4099,4100,4101,4102,4103,4104,4105,4352-4356"\r > ofonod[9917]: plugins/udevng.c:remove_device() > /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/ttyUSB0/tty/ttyUSB0 > ofonod[9917]: plugins/udevng.c:destroy_modem() > /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 Sounds like your modem doesn't like commands related to Cell Broadcast and goes away (likely crashes) when it receives something it finds objectionable. Try removing the CBS atom from this model or quirking the behavior. Regards, -Denis