RIM's BlackBerry 10 launch isn't scheduled until January 30th, but BBM faithful can try out a new feature on their existing handsets -- voice calling. Brand new for BBM 7 it lets users bypass the text chat their thumbs have been used to and directly talk via the service, as long as they're connected to a WiFi network, no 3G / 4G allowed. That connection restriction takes some of the shine off, but BlackBerry users traveling to / living in far locales with minute-restricted SIM cards or less reliable infrastructure make
