It's not inside information, it's common knowledge if you work in telecom area. How trustworthy ? It depends. Operators in developing countries those day might

It's not inside information, it's common knowledge if you work in telecom area. How trustworthy ? It depends. Operators in developing countries those day might completely outsource buildout and management of their network to Huawei because they frankly have best end to end portfolio I think. With operators in rest of the world, especially those that are "well established" reality is more complicated. Telecom networks having a lot of moving parts and require a lot of domain specific knowledge or proficiency with hundreds or thousands types of hardware and multitude of heavily customized per telecom needs software systems. For some of those things work might indeed be outsourced but in many cases outsourced work performed by people who function as company employees in day to day: i.e. they work in telecom office building, have employee badges, pass background checks, etc. Essentially this type of outsourcing is deeply embedded within telecom itself for a most part