HCO MB500 - Manual (Page 15)

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D. Operator Parameter:
The manufacturer has pre-set the parameters of some operators worldwide into the
camera; user needs to select one of the operators as shown below:
For instance, if the user uses an USA AT&T SIM card, choose "USA" in the "Country"
drop down dialog, then choose "AT&T" in the "Operator" drop down dialog.
If user cannot find the country or operator information in the preset software, the user
needs to do custom settings and contact local operators to fill in the operator information.
Choose "Other" in the "Country" drop down dialog; choose "Other" in the "Operator" drop
down dialog, then click the "Custom" button to access a pop-up dialog box.