ROM: 128GB. OS: Android 8.1 4G Smart Watch. 4G LTE-FDD: B1/B3/B5/B7/B12/B20/B38/B39/B40/B41. SIM Card: Single SIM, NANO USIM. 2G GSM: 850MHz, 900MHz, 1800MHz, 1900MHz. 3G WCDMA: B1/B2/B5. TD-SCDMA: B34/B39. Leia Mais