iPhone x
No network. Butt the 4G works perfect. What’s the problem ?
iPhone X, iOS 13
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This has nothing to do with High Sierra. The operating system for full Mac computers.
When there is no WiFi, it will complain no network.
When you are on the road, or inside a building, or more than a certain number of miles from a cellular tower, or less than 500 feet from a cell phone tower, you can be in a cellular shadow away from any network. So yes, you can get 4G data, but you might not have WiFi, or other data. Limit yourself to either cellular or WiFi. Trying to do both in areas trying to migrate to 5G can sometimes cause one or the other to cancel each other out.