If you care about the readability more than you care about the eye candy then that’s for you 
1) You need to enable developer mode and ssh to the N9.
2) # mkdir -p /usr/share/themes/blanco/meegotouch/libmessagingwidgets0/style/
3) # vi /usr/share/themes/blanco/meegotouch/libmessagingwidgets0/style/libmessagingwidgets0.css
4) Insert the following lines:
BubbleItem MLabelStyle#BubbleItemMessageIncoming {
font: $FONT_FAMILY 32px;
} BubbleItem MLabelStyle#BubbleItemMessageOutgoing {font: $FONT_FAMILY 32px;
}
BubbleItem MLabelStyle#BubbleTimeStampLabelOutgoing {
font: $FONT_FAMILY light 32px;
}
BubbleItem MLabelStyle#BubbleTimeStampLabelIncoming {
font: $FONT_FAMILY light 32px;
}
5) # su – user
6) $ killall -KILL messaging-ui
7) Enjoy 
Source Maemo.Org
7 Response Comments
font size is already bigger in PR1.1.. I think it’s OK now!
This opens up all sorts of possibilities for theming. Any idea where I can find the rest of the elements/ids involved in the messaging app? BubbleItem, et al?
Hi Ash,
Having just purchased the N9, I’m new to this so I’m not sure how to do the above. Are you able to email me step by step details on how.
email address – dsdarkon at hotmail dot com
Thanks,
Tom
Hey Ash,
As in Tom’s case, I´ve been using my N9 for two days only, so I have no idea on how to perform all the above explanation. Could I also get an email on how to do so?
Thank you very much!
[email protected]
You can always use the Chorded Keyboard GKOS application on N9 to type your messages and send them as SMS. The font size options are clear and big enough for anyone.
The incoming message text is aligned to the right, how to align to the left just like the outgoing message?
Pls give me a simple intruction how can I set up bigger font size for my Nokia N9.
I am aged, so my eyes are not so good. I need letters are bigger.
Thank you in advance
Mr.Nho-from Vietnam