PlatformOS Android 6.0.1 (Marshmallow), upgradable to Android 8.0 (Oreo). 4G bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 19, 20, 26, 28, 38, 39, 40, 41 - F5321. All our smartphones are factory unlocked.However, different model work with different network bands.
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