Portable computerized data communication device

A handheld radio frequency (RF) wireless communications device, comprising:

• a user interface;
• a processor operatively coupled to the user interface, the processor controlling operation of the device;
• a rechargeable battery operatively coupled to the computerized system, the rechargeable battery powering the processor;
• a device housing comprising an access opening;
• and
• a cap releasably engaged with the device housing, the cap enclosing a memory that is operatively coupled to the processor,
• wherein the handheld RF wireless communications device provides spread spectrum wireless communications, and
• wherein the handheld RF wireless communications device performs provides voice communications and data communications.