ZTE Corporation GR621 사용자 설명서

 

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  Settings: You can select profile, set Browser options, 

Preferences and so on. 

 STK 

SIM card Toolkit (STK) services are value-added services provided 
by your network provider.  

Your mobile phone supports STK service, but if your SIM card and 
network provider do not support the service, these functions can’t be 
used.