Verykool R80L - Manual (Page 35)

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The mobile phone cannot search for the network
 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.
10 Maintenance Guideline
Welcome to use R80L. If there is a problem when you using the mobile
phone, please contact with the vender or consult the local maintenance
center. If your mobile phone is in need of repair, you can take your
mobile phone to local maintenance center, if there is no local
maintenance center, please pass your phone and the purchasing invoice
to the vendor.