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I leave it on all day. I believe the cellular radio only turns on when you seperate from your phone.
 
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Oh, great - thanks guys. I was wondering if the battery was capable of handling cell-always-on, but sounds like the OS is smart about only turning on the radio when necessary.
 
Here are the three states. Connected to iPhone, lost connection with iPhone/wifi, turns on cellular. There is a fourth state of wifi but I didn’t post a picture of that.
IMG_0541.jpg
 
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Do you guys keep your cell modem on all day, or just turn it on if you're out without your phone?

I usually leave it on all the time, as others have said the OS manages it very well.
However if I purposely go out for the evening without my phone and notice that my watch has low battery, I will selectively turn it on when I want to check messages or text someone. It’s a nice trick to extend the battery life if you don’t mind being unreachable.
 
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