Use the phones that all intelligence agencies use: Blackberry.
Give a CIA tech an iPhone, Android, or WinPho, and he'll have access to all of your data (on the phone) before you've finished putting the phone down. Comparing the security on these devices to the security of a Blackberry is like comparing picket fences to the shield walls of Mordor.
Blackberry's may not be hip, but they were designed from the beginning to be secure.
Perhaps you have forgotten Willem Pinckaers, a reverse engineer for Matasano Security in California, and Vincenzo Iozzo breaking the blackberry at Pwn2Own?
Give a CIA tech an iPhone, Android, or WinPho, and he'll have access to all of your data (on the phone) before you've finished putting the phone down. Comparing the security on these devices to the security of a Blackberry is like comparing picket fences to the shield walls of Mordor.
Blackberry's may not be hip, but they were designed from the beginning to be secure.