Yes. During our refurbishment process some components in these devices (mainly screens and batteries) are replaced if fallen below industry threshold using third party parts that go through a 34 point inspection by trained, professional technician . Due to proprietary licensing and software, that replacement, if not conducted using Apple parts will prompt an error message notification (see below example).
Important display Message:
"Unable to verify this iPhone has a genuine Apple display”
Important Battery Message:
"Unable to verify this iPhone has a genuine Apple battery. Health information not available for this battery”
While the part and the device will function as normal and expected, this notification will persist in the Settings menu with no recourse for removing it per Apple direction and design. But rest assure they are fully functional, unlocked, safe and ready to use and covered by Mobile Klink's 1-Year limited warranty.