Not sure what Mobile Broadband coverage is like in Brazil? However, with my mobile b/b here in UK I just plugged the 'dongle' into my laptop in Linux Mint and it presented me with a 2 click GUI & worked 'out of the box'. It loads quicker in Mint than when I use it in Vista.
Just a thought ....
UK link:
http://www.three.co.uk/Mobile_Broadb...rage_and_speed