Moving from iOS to Android (my experience)

[MissChief]

Even with no sim the phone will still connect to a cell tower to allow emergency calls.

 

[david25]

if you want to stop it, enable flight mode and then manually activate Wifi

 

[Orcvader]

Yeah, it's all fair... except I think this is like day 2 perhaps? You shouldn't really judge until about 2 weeks time. I've set mine to stop charging at 80% now and still hardly ever go below 50%.

This. Once adaptive battery learns your habits battery life should improve.

 

[MrRockliffe]

Conveniently out of the return period by then