User Manual

Getting Ready
20
4-2. Check the LED status.
At this point, the <POWER> and <ERR> lamps will blink.
(Green)
(Orange) (Red)
If the <ERR> lamp comes on at this point, that SIM card cannot be
recognized by the RTR-500GSM. One of the following may be the reason:
* The SIM Card Holder may have been unlocked.
* Touching the IC area of the SIM card may leave a residue of dust, dirt, or oil,
which in turn may cause improper electrical contact.
* Damage to SIM cards may be the result of static electricity and/or other
causes.