3G HSDPA via laptop PC Card. Insert a 3G SIM card, maybe from your phone, into the slot by the side of the PC Card, push the card into a laptop slot, and you’re good to go.
This was the way I used my laptop for mobile internet. Eight years ago in 2008 the now-ubiquitous Android smartphones were not yet on the market. And Android internet USB tethering only came to the world in the middle of 2010, with Android 2.2 Froyo.