I still use a Blackberry for a few reasons. First of all its the device of the people, since its cheap and light, has removal battery and keys that are always sweaty and sweet, aka personification. People can type on it with gloves on (touchscreens wouldn't allow that). Massive up side generally is that nobody uses it, ipso facto the connection speed will always be higher.
Crucial point, each of us should pay respect to the young men and women of the 2011 London Riots, who evaded police detection by using encrypted BBM texts, telling each other not to loot community centres like Hackney Empire (E8) and focus on ecumenical businesses like Sports Direct. Hashtag Impunity.
Functionally the thing I like most about BB is called Word Substitution. It's the ability to create your own superlengthy shortcuts. This was kept throughout Blackberrys, all the way to the new Q10 model.
Here are some of my best screenshots of Words Substitutions:
* WÜBÛ2 (What've Ü Been Ûp 2) was coined by Billie JD Porter (google her).