So I've been really interested in getting an iPad (still need to decide which version but thats a whole other subject!), mainly for work purposes in places that don't have wifi (I travel to different sites during the week). Price is an issue, so I am not sure if it is worth having the cellular built into the iPad or get the mobile hotspot feature on my iPhone 4S and use the wifi on that. The only downside would be losing my unlimited att plan if I add the hotspot feature. Anyone have any experience using the iPad both way? Do usage and speeds differ at all? I'd hate to kill my iPhone battery using the hotspot, but it might be worth it to save the 170$. Thoughts?