Celcom Timur (Sabah) Sdn Bhd (CT Sabah) was established as a joint venture company with the purpose of providing fibre optic transmission services in Sabah.

In tandem with its main business in providing the physical fibre cable transmission service primarily to the telecommunication network operators, CT Sabah had completed its trunk fibre optic network in Sabah, including submarine cables, making it the only company currently with a comprehensive trunk fibre network in Sabah.  The fibre optic network spans from Labuan and up to Tawau.