Posting on/reading MTF on the phone is one of the worst things in life, so definitely use the big computer screen.
Why don't you have a data plan at the moment though? I thought that usually comes with smart phones.
I browse MTF on my phone when I'm bored on the train while on my way home.
I hate that the emoticons are different though.
And some don't even show up.
I have a pay-as-you-go account from a while ago, with an old phone that didn't have any internet capability anyways. I just got this new Samsung phone a few weeks ago. I'm not sure if I'll get a data plan; seems like a waste of money. The new phone is already an improvement, with a camera, big screen, full keyboard, music player, etc. And I can still use the internet if I catch some WiFi. So at this point I don't mind being a bit handicapped of all its features.
I just went on MTF through the browser; didn't get the special app.