Currently there are a large number of iPhone tags:
Most of them have a very small number of questions and may be appropriate to keep individual, but there are 2 heavily used tags that are basically synonymous:
Almost any question about
iphone-sdk is about programming the
iPhone. While the other direction may not be strictly true if you include jailbroken devices, looking at the 5,000 iphone questions and the 2000 iphone-sdk questions less than 2% even mention the word jailbreak, much less are about jailbroken phones.