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Base Band 5, abbreviated as BB5, is themobile baseband generation implemented onNokiamobile phones and the replacement for prior DCT (Digital Core Technology) generations.

This generation of Nokia phone basebands uses a new range of chipsets, bus systems and components as well as enhanced security mechanisms preventing manipulations offirmware and system configurations. The phones' system interface has changed over from previous generations to allow, for instance,flashing of the device via USB.

In 2013, the BB5 platform was replaced withMediaTek and laterSpreadtrum/UNISOC chips.

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