Per https://www.apple.com/watch/cellular/ https://www.apple.com/watch/cellular/ it's either 2 and 4, or 1 and 3 (and 7). The iPhone 8 supports all [1]. That wou

Per https://www.apple.com/watch/cellular/ https://www.apple.com/watch/cellular/ it's either 2 and 4, or 1 and 3 (and 7). The iPhone 8 supports all [1]. That would confirm that the Apple Watch uses more specialized cellular chips. [1] https://www.apple.com/iphone-8/specs/ https://www.apple.com/iphone-8/specs/