As I imagine with alot of people, I'm looking to pick up an iPhone in the near future (in the UK) but am in no need for the monthly tarrif. My plan was to jailbreak it when the clever fella's have broken update 1.1.2. That's pretty much all the thought I've put into it. But got to thinking a little more today, and what exactly are the downfalls to jailbreaking an iPhone? I understand you can't use visual voicemail anymore, but that doesn't bother me to much. Any other features stripped or unusable?