Your phone uses a lithium ion battery. Which should not be deep cycled or worse run to exhaustion. Ideally you'd want to charge it to ~ 85% and then shallow cycle it thereafter.
There is some debate about "battery calibration". Meaning that some people believe that the best way to calibrate the battery meter is to run the battery to 0% once. There isn't a concensus about whether this calibration works, but if you elect to do so, it is a strain on your battery. I wouldn't do it more than once if you can help it.