The "information header" is the upper portion of the terminal screen that displays communications and power indicators (as pictured here). Listed below are the important status indicators:
3G Communications Status
[1] Mobile Network Signal Strength (3G)
[2] 3G Communications Configured and SIM card installed.
Temporal
[4] Time (hh/mm)
[5] Date (dd/mm/yy)
Power
[6] Terminal Connected to External Power Source (refers to the "plug" portion of the battery icon)
[7] Battery Charge Level (refers to coloured bars in the battery icon)