SIM900 Hardware Design
Abbreviation Description
MC Mobile Equipment list of unanswered MT calls (missed calls)
ON SIM (or ME) own numbers (MSISDNs) list
RC Mobile Equipment list of received calls
SM SIM phonebook
NC Not connect
1.3 Safety Caution
The following safety precautions must be observed during all phases of the operation. Usage, service or repair of
any cellular terminal or mobile incorporating SIM900 module. Manufactures of the cellular terminal should send
words the following safety information to users and operating personnel and to incorporate these guidelines into
all manuals supplied with the product. If not so, SIMCom does not take on any liability for customer failure to
comply with these precautions.
When in a hospital or other health care facility, observe the restrictions about the
use of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitive
to not operate normally for RF energy interference.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it be switched
off. The operation of wireless appliances in an aircraft is forbidden to prevent interference with
communication systems. Forget to think much of these instructions may lead to the flight safety
or offend against local legal action, or both.
Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes.
Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or
where blasting operations are in progress. Operation of any electrical equipment in potentially
explosive atmospheres can constitute a safety hazard.
Your cellular terminal or mobile receives and transmits radio frequency energy while switched
on. RF interference can occur if it is used close to TV sets, radios, computers or other electric
equipment.
Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a
vehicle, unless it is securely mounted in a holder for hands free operation. Before making a call
with a hand-held terminal or mobile, park the vehicle.
SIM900_HD_V1.05 06.23.2010
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