Usb modem problem in tablet

hello , i have acer icona a1-830 tablet with 4.2.2 android version
And when i connect it wih 3g usb modem with otg , dongle settings appeared to set apn for the usb
I set it with my nerwork info , but when i turn it on , it search for 1 min then said connected , after that tablet freeze d still gives systemui error (force stop) .. and i had to restart the tablet
And there is option called modem port , it set bu default (ttyusb2)
Pics in attachment


Sent from my A1-830 using XDA Free mobile app

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