The CCP imprisoned him and provided him a cell phone and internet so that he can communicate with the outside world... Well, if that also convinces you that I have nothing to say. This kind of propaganda from the West is something China cannot learn.
If it’s genuine, it might also be smuggled in? Also, cell phones tend to work anyway there’s cell coverage.
https://www.vice.com/en_us/article/zngpz4/prison-phones-that...