Verykool s810 - Manual (Page 43)

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In the operation process, the mobile phone may display the
following operating tips:
“No SIM”
 You must insert the SIM card before using the mobile phone. If
the SIM card has been inserted, please take it out and wipe clean
with a dry cloth on the gold metal part, and then insert the SIM card.
Or you are outside the network coverage area of the service
provider. But another network found will allow you to make
emergency calls with sufficient signal strength.
“Input PUK code”
 The SIM card has been locked since the wrong PIN code has
been inputted three consecutive times. You must consult your
network provider for special PUK code with eight numbers to unlock
the SIM card (The PUK code may have been provided with your PIN
code at the same time).
Warning:
The SIM card will be permanently locked if you input the wrong
PUK code for ten consecutive times then you must apply for a
new SIM card from your network provider.
17 Radio Frequency (RF) Exposure and SAR
This phone is designed and manufactured not to exceed limits for
exposure to radio frequency (RF) energy set by the Federal
Communications Commission (FCC) of the U.S. Government.
These limits are part of comprehensive guidelines and establish
permitted levels of RF energy for the general population. The
guidelines are based on standards that were developed by
independent scientific organizations through periodic and thorough
evaluation of scientific studies. The standards include a substantial
safety margin designed to assure the safety of all persons,