I find it hilarious that everyone here seems to think that they are James Bond, and that every FBI agent is chomping at the bit to gain access to the $26.32 in their bank account, their duck-faced Instagram selfies, lame tweets, and Facebook posts (which apparently are easy to get even without access to your phone).
Cops can get a warrant and search your entire home and office, your cell calls, your financial records, and nobody has any problems with that. But my smartphone? No, HELL no!
Um, the FBI are trying to solve real federal crimes to protect you, dummies, not gain access to Joe Q. Boring's iPhone.
At some point, there is going to be a horrendous kidnapping, mass murder, or terrorist crime which could be solved or thwarted by simple access to a smartphone, but nope - thanks to privacy and encryption uber alles, it's a no go.
Then you'll all whine about how ineffective the FBI is.