Mobile phones just keep getting more and more powerful, adding on new functions and graphics and capabilities by the week. Now they could join in the battle against heart attacks. A prototype heart monitor that works in concert with a phone, connecting via Bluetooth, could alert patients and doctors about abnormal cardiac activity through a text message. The external device sends signals to the phone, which includes a program that checks for irregular beats. When something odd registers, both patient and doctor are notified, which allows them to act earlier, and possibly prevent a fatal heart attack.