Verykool i600 - Manual (Page 40)

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Note: If you enter wrong PUK ten times, the SIM card gets invalid. In
that case, you have to consult with your network operator for a new SIM
card.
PIN2 (4 to 8 digits)
The PIN2 code, supplied with some SIM card, is used for some
functions, such as Call Cost, Fixed Dial and so on. Please consult your
network operator to confirm whether your SIM card supports those
services or not.
If you enter wrong PIN2 code for three times, the SIM card gets locked
and you will need PUK2 to unlock it.
1. Enter the correct PUK2 to unlock PIN2, and then enter the new PIN2
and press OK.
2. If you are prompted to enter the new PIN2 again, enter it and press
OK.
PUK2 (8 digits)
The PUK2 code, supplied with some SIM card, is required to change a
blocked PIN2 code. It may be supplied with the SIM card. If not, contact
your network operator.
Note: If you enter wrong PUK2 ten times, the SIM card will get invalid.
In that case, you have to consult your network operator for a new SIM
card.
Barring Code
To activate call barring, you need a Barring Code. You can obtain the
password from your service provider.
Battery Information
Charing and Discharging
 The charger is designed to be used in temperatures between 0°C to
40°C.
 Do not charge the phone in wet and damp conditions.
 We strive to produce products in compliance with global
environmental standards