HCO MB600 - Manual (Page 16)

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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.
Complete the following information (please confirm the accurate information with your
local operator), and click OK to save the settings. Take Germany T-Mobile for example
as shown below.