I have a Vigor 2850n. I want to kick BT landline into touch and use a 4G dongle. The advice on compatible dongles on the Draytek site (http://www.draytek.co.uk/download/support/DrayTek_USB_Modem_Support_160117.pdf) looks a little out of date - at least many of the dongles are no longer available to purchase. It also does not look like the 2850 range support many dongles. Does anyone have any advice on suitable dongles for UK use? I'll connect via GiffGaff which uses the O2 network. Thanks.