Korean version of Note 8, SM-N950N, 256 GB internal memory, the same. It is an unlocked Korean phone from SK Telecom which I use in the Republic of Georgia. Functioned perfectly well for two years now, but the september OTA upgrade to bootloader version 5 resulted in the "IMS Service keeps stopping" problem. Factory reset, deleting data/cache/force stopping IMS-related items in the apps list in settings, and flashing the latest firmware (the same one which caused problem OTA - could not downgrade because all previous versions are bootloader v.4) from SamMobile with Odin did not help. Interestingly, when I remove the sim card, the problem disappears - the nagging alert, which otherwise pops up every 10 seconds and freezes the phone, disappears.
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