1) please fill the form embedded in new posts (to win time) :
Operating system name and version: Version of smsd: Smsd installed from: sources / package repository / from elsewhere... Name and model of a modem / phone: Interface: serial / USB / some adapter...
2) if node /dev/ttyUSB2 is not found, I don't see how your smsd could run (from what you said).
Operating system name and version: Debian 6.0.5 Version of smsd: Version 3.1.11 Smsd installed from: package repository Name and model of a modem / phone: Huawei E620 Interface: USB
Mmm, not sure what to answer here...I'm pretty sure I have SIM working on ttyUSB2 currently.. Maybe something wrong with the udevadm command? Thanks