Based on the logs your device performs a successful data connection, but then gets disconnected.
Could you enquire your ISP if internet.ventelo.no is the correct APN value, or try disable Auto APN in Network -> Interfaces mobile interface settings and simply set an empty Custom APN field?
Otherwise, I would like you to perform a modem module firmware update. For instructions, check this thread. Your modem ID is 1-1.4, latest firmware: SLM750_VE_4_0_17.