Should I blow my upgrade on an iPhone 4S? (Ask Maggie)

In this edition, Maggie Reardon offers advice on plotting iPhone upgrade strategies now that the iPhone 5 didn't materialize. And she offers an explanation of international roaming on the new iPhone 4S "world" phone.<img src="http://feeds.feedburner.com/~r/cnet/tcoc/~4/-NtvToDREsg" height="1" width="1"/> [More]