Embodiments herein describe a wristband for securing the smart electronic wrist device to the human subject. A heart rate sensor, coupled to the wristband of one embodiment, attaches to the human subject, and to generate electronic signals responsive to the heart rate of the human subject. An analog to digital signal converting circuit (ADC), electronically coupled to the heart rate sensor, to receive electrical signals generated by the heart rate sensor. A digital signal encoding circuit, electronically coupled to the ADC, to convert the electrical signals to data signals. A wireless communication interface to transmit the digital signals wirelessly to a handheld phone call device. The handheld cellular device is wirelessly coupled to the smart electronic wrist device to receive data concerning the human subject derived from the data hear rate signals, and is also coupled to the data communication network to transmit the data heart rate signal.