Nokia and Multitasking phones

Nokia the world largest producer of moblies lanch many cell phones and series of its product Nseries, Eseries the latest Xseries and many other models its all symbian cell phones are multitasking now the other companies are also lanching thier phones which are used as multitasking Apple i phone Microsoft window 7 Blackberry HTC phone just lanched their phones in market in this round about 2010 and nokia is leading in this field from the beginning when it starts manufacturing cell phones