Some SIM cards need to validate the PIN number by factory default. If so, please plug the 3G modem into your PC directly, and then disable this function in the bundled 3G modem utility.

i think the TL-MR3020 can be set as a repeater to extend your virginmedia wifi signal, but i am not sure about the compatibility between the pen connector and router. you may check the tplink l...

i believe the modem has good security,as i can find the option to enable firewall and NAT on wan settings........not quite sure about the DoS protection though

you may try different usb port or computers, i can not tell from your description, it;s the modem hardware can not be detected or you can not press connect button ??

you may refer to part 4 about how to correct the disconnection problem in the link here, http://www.tp-link.com/en/article/?faqid=400. i encountered similar problem before and received the link from...

if you can set your smartphone as a so called hotspot, possibly the tplink can be used as a repeater.