Mobile Network Support and BandApple iPhone 12 Pro Max have Dual SIM - nano‑SIM and eSIM, Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM, dual stand-by) - for China Card Slot,Apple iPhone 12 Pro Max support dual mode based on GSM/CDMA based network providers. Apple iPhone 12 Pro Max mobile device support GSM 2G Band Frequency at GSM: 850/900/1800/1900, Apple iPhone 12 Pro Max mobile device support CDMA 2G Band Frequency atand Hight Speed 3G Network Band at HSDPA 850,HSDPA