I had an ancient version of a PDA and used it... If it is public that you have a Blackberry,it may become an official record and subject to the law.

Be very careful. I got around it all by not saying much and not using systems that captured the data

What I did do was have a personal computer that was hooked up to a private phone line (sounds ancient). So I could communicate with a wide range of friends directly without it going through the State Department on their personal email accounts. I did the same thing on the road in hotels.