So don't bring a phone. Get one locally. Maybe not so great either, but at least your phone won't get pwned.
Antivirus firms start flagging spyware installed by Chinese border control July 4, 2019 https://www.theinquirer.net/inquire...rus-firms-flag-chinese-spyware-border-control
As I remember Kaspersky did detect (some) in past. I don't know about other vendors. I guess that even if they do, they are not so loud about it.
Chinese Antivirus Companies Don’t Flag Chinese Border Malware July 12, 2019 https://www.vice.com/en_us/article/...dont-flag-chinese-border-malware-bxaq-fengcai