Your PPP stuff shows cuaU0 and it needs to be cuaU0.2
ugen1.2: <huawei technologies="">at usbus1
u3g0: <huawei 0="" 2="" technologies="" huawei="" mobile,="" class="" 0,="" rev="" 2.00="" 0.00,="" addr="">on usbus1
u3g0: Found 4 ports.
umass1: <huawei 0="" 2="" technologies="" huawei="" mobile,="" class="" 0,="" rev="" 2.00="" 0.00,="" addr="">on usbus1
umass2: <huawei 0="" 2="" technologies="" huawei="" mobile,="" class="" 0,="" rev="" 2.00="" 0.00,="" addr="">on usbus1
Nov 26 23:23:04 ppp: [opt3_link0] MODEM: Fail to open serial port /dev/cuau0 on speed 115200
Good luck and let us know if fixed.</huawei></huawei></huawei></huawei>