Sounds like iCloud syncing some data. You need to look at message settings and make sure you aren’t keeping things forever.Hi, I have the new iPhone 14 pro max 256, and it has been the biggest disappointment. Spoke to apple support, for hours, and they could not help. I have tried erasing all pictures, deleted Apple TV, cleaned out text messages. Did it all without WIFI, however as soon as turned back on wifi data has crept back up to 255!