It's one of those functions that, in addition to an on/off switch, if you tap on it, it will take you to a sub-section with individual options, as well as a link to "Learn about power saving", an explanation of what it does.
I've seen a big difference using airplane mode. Especially when I'm at work, I work in a brick building so signal is sketchy at best. They phone isn't searching for a signal the whole day so that seems to help.
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