Do you need cellar on the Apple Watch?

Need it? Probably not. Are the situations under which it's nice to have? Depending on your needs, yes. If you want to leave your phone behind and still be able to make and receive calls and stream music, it's nice. Only you can answer if it's worth the money to you.

The GPS only Apple Watch can do Everything the Cellular model can do AS LONG AS your iPhone is nearby, where nearby is generally somewhere in the same moderately sized home. The Cellular model allows you to leave your iPhone at home while you go for a walk, run, bike ride.