There may be a number of reasons why Huawei does not use Projet RF chips.
First, Huawei may already have its own RF chip solution, which may be due to its technical strength and research and development capabilities in the field of communications.
Second, Huawei may have established long-term relationships with other suppliers, using their RF chips to ensure product stability and performance.
In addition, Huawei may also consider the reliability and cost effectiveness of the supply chain, and choose other suppliers of RF chips.
Finally, Huawei may also consider the factors of market competition and choose different RF chips from competitors in order to gain differentiated competitive advantages in the market. In short, Huawei's non-use of Vategon RF chips may be based on a comprehensive consideration of various factors.