Just realised
I should explain what Tapatalk is for the people who don't know
"If you've ever tried to follow multiple forums on a mobile browser, you know how inconsistent of an experience it can be. We save you time and make it easy to follow all of your favorite online communities on your mobile device.
You can monitor, post, and add photos to all your favorite forums, all in a single app. You can even elect to receive push notifications on your favorite threads.
Tapatalk can also help you discover new forums based on the topics you like to follow."
It has a great UI for mobiles and has push notifications for all sorts of functions, i.e PM's bookmarked posts etc...
It remembers your username and you can see everything you can see on the desktop
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https://tapatalk.com