[ubuntu-za] Vodafone Modem Remaining Data

[marvel chigama]

Hie all
I have a Vodafone USB modem K3772-Z i'm trying to use prepaid manager app
and gsm-ussd to querry the remaining data and be able to top up data with
no success.
I am getting the following error from gsm-ussd

ERROR: Modem port "/dev/ttyUSB1" is not accessible. Possible causes:
* Modem not plugged in/connected
* Modem not detected by system
* Wrong device file given
* No read/write access to modem

and the following from Prepaid manager:
Modem error: ussd_initiate failed:
GDBus.Error:org.freedesktop.ModemManager.Modem.Gsm.Unknown: Unknown error

I want to be able to top up without removing sim card.
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