When you purchase an uncapped OpenWeb account, you effectively purchase a 512k/1024k pipe into the ISDSL network. If we allowed more than 1 concurrent session, you would be getting 1024k (2 sessions) of bandwidth and only paying for 512k. As such, multiple sessions are disabled on OpenWeb uncapped accounts.
My router is on 24hours a day, bar the IP reset. Yet I have around 8Gb of traffic on my account in the last two days. The first day my PC was turned off, last night I turned off my router as well and this morning my account usage almost doubled. I have emailed mrBeep and OpenWebSupport to get my details changed this morning, I even called just now and got told support cant change my details I have to wait for mrBeep to change it.
I am happy with the service I get from the line (and I'm sure someone else is as well), but I am not too impressed with the support as this is the first time I've ever had to deal with them.