If you bought a device from USA market make sure to check blacklist status. All phone models including Samsung, iPhone, Nokia, Motorola, LG and other coming from american networks like: AT&T, T-Mobile, Verizon, Sprint etc are supported.
Check if the device is reported as lost or stolen, before you buy it. Blacklisted device cannot be used in a country were it was reported.
IMPORTANT !!! The result will show only two messages "clean" or "blacklist", it will not show if there are any unpaid bills.