We've hit that point on the calendar again which marks the beginning of Daylight Saving Time. The point in which we "spring forward" and set our clocks ahead 60 minutes in the wee hours of Sunday morning.
So what will you have to do with your phone? The answer probably is this: Nothing. Nothing at all.
So long as you don't have an iPhone, which is notorious for issues with Daylight Saving Time, your phone should automatically adjust, assuming your using network-provided time. That's where your phone periodically checks in with whatever operator you're using to see what time it is. (It's also how your phone knows when you've changed time zones while traveling.)
Wake up Sunday morning, and you should see a little message about how it's adjusted for Daylight Saving Time. The bad news is you probably just lost an hour of sleep.