It drains the battery really quickly in my experience. On my (admittedly old) iphone a 30 minute subway journey without airplane mode will drain about 10%. Als

It drains the battery really quickly in my experience. On my (admittedly old) iphone a 30 minute subway journey without airplane mode will drain about 10%. Also even if i'm listening to music I have downloaded locally, Apple Music will do a system-wide popup complaining that it lost cellular connection. Sometimes in Safari a webpage that was downloaded at the station will suddenly erase itself and attempt to refresh itself upon losing connection. Those are usually the kinds of ad-ridden sites that are making nonstop ajax calls, but sometimes that's what i'm reading.