Tbh... If you intend to stick with that usage routine, just buy the cheapest thing you can get. Any old "dumbphone" out there is good enough for a brief call. *shrug*
If, however, you're willing to give the full smartphone experience a try - on-the-go access to emails, newsfeeds, social networks, web browsing, maps, time management & organization apps, music on the go, videos on the go, next-gen games etc. - get a Nexus 4 if you can get your paws on one. Off-contract & unlocked at $299 in the
Google Play Store (<-link!) for the 8-gig model, hands-down the best value out there. Even tho it's a bit costlier upfront than buying a subsidized phone, over the course of a year or two it is HIGHLY likely to come out significantly cheaper than even a midrange phone attached to a contract.
And it's still one of the best phones out there spec-wise (excluding the fairly crappy storage space). And gets the OS updates months before any other line of phones.