A relative of mine has bought (actually got bounced by a Vodafone salesman into buying) a "Vodafone Smart 4 turbo" phone, which does indeed bear the name of Yulong, the manufacturers with the Coolpad brand, model number 889N.
I registered with Palo Alto Networks in order to find out which files are diagnostic:
"...components are contained in
packages with the following file names:
I can confirm that, in this specimen of Smart 4 turbo, none of those files are visible in the 'ES File Explore' file manager app; the report doesn't say that the files are hidden or anything, so I am cautiously concluding that the phone is not carrying the CoolReaper backdoor.