United States and Canada
AT&T, T-Mobile, Verizon, Sprint, US Cellular, Cricket, Boost Mobile, MetroPCS, Tracfone, Total Wireless, Mint Mobile, Visible. Canada: Rogers, Bell, Telus, Freedom Mobile, Koodo, Fido. The check shows exact Carrier Lock status, Installment Lock (financing) and unlock eligibility.
United Kingdom and EU
EE, Vodafone UK, O2, Three, Sky Mobile, Tesco Mobile, Lebara, Giffgaff. Continental Europe: Deutsche Telekom, Telefónica O2, Orange, SFR, Bouygues, TIM, Vodafone Italia, Movistar, Yoigo, KPN, Proximus. Full GSMA database for country-of-origin detection.
Russia, CIS and Balkans
MTS, Beeline, Megafon, Tele2, Yota, SberMobile (Russia). Ukraine: Kyivstar, Vodafone UA, lifecell. Balkans: VIP, Telekom Srbija, MTS Srbija, Yettel, A1 Serbia, m:tel, Crnogorski Telekom. Common origin for gray-market iPhones sold in Western Europe and the Middle East.
Asia and Middle East
China Mobile, China Telecom, China Unicom, SoftBank, NTT Docomo, KDDI au, Singtel, StarHub, Maxis, Etisalat, Du, STC, Mobily, Zain, Ooredoo. Critical for verifying Chinese iPhone variants (physical dual SIM) often resold as "global versions" on secondary markets.