I have a BT router and I still can not get on simply. But..... This works sometimes. Type cmd in the command field, you will get the C\ user bit or similar. If I then type ipconfig/flushdns and then push enter. It comes up with the message dns cleared. I then turn my router off and unplug the phone bit and the power and leave for about a minute. If I then turn it all on and go into Google and type
http://oghf.org/uk and enter. I can then get in 5 times out of 10 But only once. I have to do all that again if i want to get on again.
If i get a minute I will spend a bit more time researching this and find a permanent fix. I flirted with adjusting the IPv4 and ipv6 address settings, but didn't actually try playing around with them as I didnt have time to put it right if I mucked it up. I;m away a lot at the moment and would have been in big trouble if I mucked the home PC up and then buggered off )).
But it is down to my BT router, that I'm sure.