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ACTUAL fertility awarenes/natural family planning is really easy, but it requires very specific daily observations of multiple fertility symptoms. You can't use a computer to tell you when you're ovulating or when your period is coming. This is why the rhythm method doesn't work: it relies on every woman having a cycle that is a set number of days, with presumed ovulation on a certain day of that cycle. And you know what you call people who use the rhythm method of birth control....
I hope this phone has a REALLY BIG RED DISCLAIMER.