Pfsense virtualbox 3g modem hangup

[kidalabama]

i am using 3g for connection internet. and i am using virtualbox for running pfsense. i am tested 3 modem.
huawei e173g
huawei e176g
zte e190

all modems connecting internet.
but 5 seconds later internet connection closing. and never open.

and when shutting down virtual pfsense freezing and dont shutdown.

i am tested openwrt in virtualbox. openwrt is running very stable.
when shutdown openwrt virtual macgine crashed.