Viewing the forum using a small screen phone is very straining to the eyes. You will need to zoom in more often if you are reading lengthy topics or following a discussion so using a mobile phone for daily use is not advisable. I'm only using my phone to check my message and have an update on the topic I'm following. I really suggest using a tablet or iPad instead for a better viewing experience if you can't afford a desktop. This will save you time on the hassle of reading text. I believe there are browsers that automatically adjusts zoom based on text size but the forum aesthetics will not be appealing to read when it was zoom to that level.