That's a hard one to answer bc 2gb seems like alot but if u are constantly streaming music, pandora, slingbox, etc... That will go fast and get VERY expensive for the overage. I use pandora, iheartradio, Dan Patrick show daily during my 8 hours at work and normal Internet usage and I average around 4-4.5gb monthly. And remember too that there are alot of Apps that use data constantly, which is why the iPhone required unlimited data in the first place, so take that into acct also. Hope that helped