I use my cellphone to access the forum most of the time and it works very well. I cannot find an option to access forum options so I can mark forums read. Not sure if its available in the mobile view?
I also use my phone most of the time. Mine auto Mark's what has been read. Don't recall ever changing any settings. Hopefully a moderator will chime in.
Added thought; I view using the website, not the app thingy.
I use the quicklinks when using a web browser but don't have that available in mobile view. I also don't use tapatalk, using mobile browser. I'll try setting it to full site but that makes everything very small.