Not in the way you're thinking. Phones do exist that can do this, but to my knowledge the one you are holding cannot. Dual-SIM GSM phones have been around for a while, but just not much in the USA. I don't know if there are CDMA phones that have two lines. People have been asking for it for years and I think it makes perfect sense. You could rig up some kind of forwarding scenario as a workaround.