Welcome to the every changing world of technology.  There will always be a new 'something' just around the corner.  If you are satisfied with the current product and features, and are willing to pay the ammount for it; by all means go ahead.  Waiting never helps
If you mean using your iphone's 3G as a modem/internet connection to surf from your laptop, yes you can.

Just connect your iPhone to your laptop and then enable Internet Tethering under settings on your iPhone.