BlackBerry (BB 0.81%) is one of the most talked-about stocks on the market today, and this week is going to be a big one for the company. The company reports earnings after the bell tomorrow, and many eyes will be watching to see how it comes out, and whether it can meet analysts' low expectations. In the video below, Fool tech and telecom analyst Andrew Tonner tells investors why this week, and the launch of BlackBerry's new Z10 handset, will be absolutely critical for the company, and what signs will tell investors if BlackBerry can stay afloat in a market dominated by iOS and Android.