The product is suitable for areas with 2G network. You can use this product as long as your current regional supplier supports GSM. If you find that you cannot use the mobile phone after receiving it, it may be that your current area does not support 2G network or your supplier has stopped 2G network services. The following list can be used as your reference: Mainland China: Use GSM-900, GSM-1800, GSM-850 and other frequency bands, as well as TD-LTE and LTE FDD technologies. Hong K.ong, China: Use B3, B38 frequency bands. Thailand: True Move and DTAC use the B1 band. South Korea: SKT, KT, and U+ use the B3 and B5 frequency bands. Italy: TIM, VF, H3G use B3, B7, B20 frequency bands. UK: Uses B3 band. Spain: Telefonica, VF uses B3, B7 frequency bands. France: Use B3, B7, B20 frequency bands. Russia: VimpelCom, MTS, MegaFon, Rostelcom, Vainakh Telecom use the B7, B20, B38, B40 frequency bands. South Africa: MTN, Neo Tel, Telekom/8ta, Vodacom use the B3 and B40 frequency bands. United States: AT&T, Verizon, T-Mobile, and Sprint use the B2, B4, B5, B12, and B17 frequency bands. Canada: Rogers, Bell, and Telus use the B2, B4, B5, B7, B12, and B17 frequency bands. Taiwan, China: APT, Chunghwa Telecom, Fa.rEas Tone, Taiwan Mobile, and TSTA.R use the B3, B8, and B28 frequency bands. Australia: Telstra, Optus, Vodafone, TPG, NBN & Co use B3, B7, B28, B40 frequency bands. New Zealand: 2degrees, rk, Vodafone use the B3, B7, B28 frequency bands. A.rgentina: Cla.ro A.R, Nextel A.R, Telecom Personal, Movistar .A.R use the B4 band. Brazil: Cla.ro, Oi, Vivo, Tim, Nextel, On Telecom, SKY Brazil use the B7 band. Japan: NTT DoCoMo, Softbank, KDDI use B1, B3, B19, B21, B8, B41 frequency bands. India: Aircel, Bha.rti Airtel use B3, B40 frequency bands. Chile: Cla.ro, Entel, and Movista.r use the B7 band. Mexico: Telcel, Movista.r, and Nextel use the B2 and B4 frequency bands. Supported languages: English (default) Greek, Serbian, Cambodian, Italian, Dutch, German, Polish, Hungarian, Czech, Romanian, Turkish. Color: black, gold, blue, Note: If you need to use this product in Vietnam, you need to change the serial number as follows: First, use your local mobile phone to enter *#06# to query lMEl1 and lMEl2. Then follow the video method and use i16pro to enter *#66*# to improve the effective lMEl1 and lMEl2. If you have any other questions, please contact our professional customer service team