While I would love to piously inveigh against smartphones, I recently got a Droid and the machine is simply fantastic. It has so many uses, it's almost unlimited. This is after having the most basic of the basic cell phones during the whole initial Iphone / Blackberry boom.
Catholics are not supposed to be Puritans who reject everything in modern culture just because it's modern. The point is to reject things that are SINFUL, not things that are modern. The smartphones are like the Internet -- and really are basically smaller laptops with phones and cameras built in -- in that they are as good as what you use them for.
So while pagans may be using smartphones to look at porn and upload pictures of themselves making gang signs to Facebook, I can use it to study French when I'm at a deli, or to watch YouTube videos on the economic crisis in the shower, or to tap out missives when I'm stranded at church after Mass, or to take a picture of a freakish-looking "Jesus" at the Novus Ordo church and post it here on CathInfo ( I was going to do that but am suffering from a horrendous sore throat ).
The Droid is the one to get, because it is like a mini-Ipad without being as obnoxiously trendy. It has a huge screen for a phone but is easy to put in your pocket. The iphones are a little smaller, but it's enough to make a difference, it would be more of a chore to watch videos on them.