Shenzhen CE and IT Limited V400 사용자 설명서

PUK (Personal Unblocking Key, 8-digit) unlocks a locked PIN. 

If you enter the PUK incorrectly ten times in a row, the SIM 

card will become invalid. Please contact your network operator 

for a new SIM card. 

The phone lock protects your phone from unauthorized use. The 

default phone lock code is 0000. You can change it into any 

numeric string of 4 to 8 digits. 

If the phone lock function is enabled, you need to enter the 

correct phone lock code when the phone is powered on or in the 

standby mode.