I just switched to one of the new plans and it seems to have had the side effect of blocking Rdio over the cell network. Everything works fine over wi-fi but when I'm on LTE I can't even go to rdio.com. Other services like Spotify and Youtube work fine. What's up with this?
Changing your plan doesn't effect your phones ability to access a website. Not sure what could be going on. But it is certainly not because you changed rate plans. Try restarting your phone and then accessing the website again.
I'm going to guess that rdio.com somehow blocks mobile phones from using their mobile data and will only allow the site to work if it detects a wifi connection. Its not uncommon to do that, since stuff like this does waste your data a lot faster