I had a Nokia E71 some years back and I could use it for email and internet on T-Mobile's TZones $5.99 data plan. It wasn't what I'd call "comparable" to a BlackBerry, but it did email (poorly) and web access (slow).

Few carriers allow WiFi access now without some kind of a data plan. It's on a carrier-by-carrier basis so you'll have to find one that still allows it. T-Mobile was always the most liberal with data restrictions, but they're all tightening up their rules for data access, even over WiFi. Data is too big a revenue stream for the carriers now for them to ignore it.