Cellular
How much extra does it cost to have cellular on an Apple Watch?
Apple Watch
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You can easily see on the Apple.com web site the initial purchase cost difference. I think it is about $100 between a GPS only and a Cellular + GPS.
If you activate the Cellular with your iPhone carrier, it is generally about $10 per month extra to your iPhone cellular bill. This will vary depending on your iPhone carrier, and your country currency.
Cellular Carriers that support the Apple Watch, which models, and the radio frequencies each model uses:
https://www.apple.com/watch/cellular