Nokia T21: Performance and Battery Life Tested The heart of the Nokia T21 is the Unisoc T612 octa-core processor. This 12nm chipset is configured with two ARM Cortex-A75 cores clocked at 1.8 GHz for performance-oriented tasks and six ARM Cortex-A55 cores at 1.8 GHz for efficient background operations. This combination is paired with a Mali-G57