BlackBerry Browser User Agent

FYI: My BlackBerry's Web browser identifies itself (i.e., "User Agent") as: BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1

So in PHP, an inexpensive check would be something like:

if ( 0 === stripos($useragent, 'blackberry') ) {
    echo "True";
}