MIUI 13, based on Android 11

International Model – No Warranty in US. Compatible with Most GSM Carriers like T-Mobile, AT&T, MetroPCS, etc. Will NOT work with CDMA Carriers Such as Verizon, Sprint, Cricket, Boost.
Dual Nano sim 4G: LTE 1/2/3/4/5/7/8/20/28 LTE TDD: 38/40/41 – 3G: HSDPA 1/2/4/5/8, 2g Quad Band
Tmobile / Metro PCS Users: Phone Only works with previous sim card activated.