Internal 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM. NetworkTechnology GSM / HSPA / LTE. This device is compatible with any GSM carrier outside of the United States. Speed HSPA, LTE. 2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only).