A secure mobile phone-point of sale (POS) system includes a mobile phone integrated with a secure PED module. The secure PED module is integrated with the mobile phone via the phone's serial port or directly to the phone's Printed Circuit Board Assembly (PCBA). The secure PED module conforms to security standards imposed by the payment card industry. The secure mobile phone-POS system has the functionality of both the secure PED and the mobile phone and the look and feel of the mobile phone.