Verykool R13 - Manual (Page 32)

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 The mobile phone is outside of the network
coverage area (or there are physical obstructions
between the mobile phone and the transmitter),
and calls cannot be made or answered. If you are
in one room, please move close to the window.
In the operation process, the mobile phone may
display the following operating tips:
“Please Insert SIM”
 You must insert the SIM card before using the
mobile phone. If the SIM card has been inserted,
please get it out and wipe clean with a dry cloth on
the golden region, and then insert the SIM card.
“Emergency”
 You are outside the network coverage area of
the service provider. But another network area
where you locate allows you to make emergency
call according to the signal strength.
“Invalid SIM”
 The SIM card of the mobile phone is locked
and the inserted SIM card is unable to be
accepted. Please insert the correct SIM card or
contact with the vendor.
“Please Enter PUK
 The SIM card has been locked since the wrong
PIN code has been inputted for three 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 and you must apply for a new SIM card
from your network provider.