So i called mtc and i think i got a good answer this time:
-If you have a prepaid line you can get the WAP (5$ for 25mb) but it will only work for browsing, the application can't be able to use the internet.
-If you have a postpaid line you have two options. You can get the WAP service for 5$ a month but with unlimited browsing only. Or you can get the GPRS service that works with all the apps on the N900.
The guy told me that when you activate the connection by sending the msg you have to call them and tell them that you have an n900 and you've activated internet service so they will send your settings by mail.
Useful links:
Prepaid(magic): https://www.mtctouch.com.lb/autoform...ile%20Internet

Postpaid(touch):https://www.mtctouch.com.lb/autoform...0Services/GPRS