I have the same problem with two Huawei umts sticks and an internal umts modem (Samsung). The modem connects for the first time, but won't a second time most of the times. Killing modem-manager solves the problem.
I have the same problem with two Huawei umts sticks and an internal umts modem (Samsung). The modem connects for the first time, but won't a second time most of the times. Killing modem-manager solves the problem.