It's tough being ambidextrous.
Yes, the iPhone will censor your naughty language. But! There are loopholes! It looks like Chris' phone didn't censor him when he used the word "f*cks." The moral: always swear in the plural. And possibly with quotation marks around your swears.
You'll still get censored if you make it onto this site, though. Sorry. Ads, lol.