Verykool R620 - Manual (Page 34)

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 Network selection: search new network according to the
network searching mode or select the network you need from the
network list.
 Preferences: select and set the preferences of network.
Preferred mode: select the preferred network mode as GSM only,
WLAN only, GSM preferred, or WLAN preferred.
14.6 Security settings
14.6.1 SIM1/SIM2 security
PIN lock: this function can prevent others from using your SIM card
without your permission. After the SIM card PIN code is activated,
correct PIN code must be input every time when the mobile phone is
powered on; otherwise you can only make emergency call.
Note:
PIN code is the operating password and relative with the SIM
card. The SIM card will be locked, if the PIN code is wrong for 3
consecutive times. At this time, you need the PUK code to
unlock the SIM card. The PUK code may be provided for you
together with the PIN code and the SIM card. If not, please
contact your network provider.
Change PIN/PIN2: you can change the password of SIM1/SIM2
PIN and SIM1/SIM2 PIN2 through the system prompts.
14.6.2 Phone security
This function is to lock the phone and prevent other people from
using the mobile phone without permission (default password is
0000). After enable the phone lock, you must input the correct
password every time powering on the mobile phone, unless the
mobile phone cannot be used normally.
You can change the phone lock through the system prompts.
14.6.3 Auto keypad lock
After this function is activated, when the phone is in standby status
and without any operation, the keypad will be locked automatically
after the set time. Then the standby screen will show keypad locked