ZTE Corporation ZTEA16 Manuale Utente

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use. Select On/Off to enable or disable SIM password protection; select Change 
PIN to set a new PIN code.   
Note: Three consecutive times of wrong PIN code inputting will lock the SIM card. 
Then, the PUK code is needed to unlock the SIM card. The PIN code and the PUK 
code may be provided to you together with the SIM card. If not, please contact with 
your network service provider. Please change it with your own private password as 
soon as possible. 
  Handset Lock: Handset Lock can prevent your mobile phone from unauthorized 
use. Select On/Off to enable or disable the handset lock protection; select Change 
Code to set a new handset lock code. 
Note: The default handset lock code is 1234. 
  Network Call Bar: You can set any combination of the following call restriction 
options to improve security level. Please contact with the network service provider 
for detailed use. The network service provider provides a 4-digit network password 
to enable your call restrictions.   
 
International Call: Bar all international calls.