Under standard test conditions. That means 100% depth of rated discharge at a set speed (between 1 and .1 C, ie fully charged/discharged in 1-10 hours) and temperature.
Cycle life increases dramatically at lower depth of discharge, so if you normally recharge your phone when it gets to 10% it'll last twice as many cycles. High temperature and fast discharges will reduce that.
Essentially your phone is rated to be driven to 0% once a day for ~2 years, give or take a bit. Less if it gets hot, which it will, because the battery is used as a heatsink for the rest of the phone.
Cycle life increases dramatically at lower depth of discharge, so if you normally recharge your phone when it gets to 10% it'll last twice as many cycles. High temperature and fast discharges will reduce that.
Essentially your phone is rated to be driven to 0% once a day for ~2 years, give or take a bit. Less if it gets hot, which it will, because the battery is used as a heatsink for the rest of the phone.