Took me few minutes, but looks like one query that works for these on Alibaba/AliExpress/taobao is "click farming phone". "手机 主板 服務器"(phone mainboard server) might also work in some places.
I see bunch of multi GPU crypto mining style chassis as well as just USB mass charger styled ones. This is something I just came across randomly so I have no experiences or connections for these, but hope this helps. It's kind of cool looking if it weren't for scams.
edit: note, it's not clear if they come with the phone PCBs or phones are customer supplied. The "boards" mentioned in some of listing seem to imply that it refers to adapter boards for the phones, through subtle wording
I see bunch of multi GPU crypto mining style chassis as well as just USB mass charger styled ones. This is something I just came across randomly so I have no experiences or connections for these, but hope this helps. It's kind of cool looking if it weren't for scams.
edit: note, it's not clear if they come with the phone PCBs or phones are customer supplied. The "boards" mentioned in some of listing seem to imply that it refers to adapter boards for the phones, through subtle wording