Verykool R13 - Manual (Page 31)

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When the calculation of dividing 0 overflows, the
result is larger than 999999999999 or less than
-999999999999, the mobile phone will display the
wrong hint “E”.
4.9.4 Stopwatch
In typical stopwatch screen, you can select the
typical stopwatch or nWay stopwatch and view
records that you have saved.
4.9.5 STK
This function is provided by the network operator.
According to the services provided by the SIM
card, there will be different options appearing in
this directory. The name and content of the menu
are based entirely on the services provided by the
network operator. For more information, please
contact with the network operator.
Note:
This function depends on whether the network
operator provides this service and whether
you have ordered this service.
5 Common Questions
The mobile phone cannot be powered on
 The mobile phone cannot be powered on since
the battery voltage is too low. Please recharge the
battery.
Unable to make some calls
 Call barring has been set and barred
utilization of the mobile phone. Please check
and cancel call barring.
Other person is answering my call
 The mobile phone has been set into divert
your calls to another phone number. Please check
and cancel call divert.
The mobile phone cannot search for the
network