It's counterintuitive, but a hearty walk can help... like long enough and brisk enough to where you get your heartbeat up for like 20-30 minutes.

I had my neck go out dozens of times over a period of several years, and took me longer than it should have to realize that staying home and staying immobile made the injury linger... whereas some light physical activity helped the pain go away quicker.

To prevent in the future, pay attention to your posture... particularly when using cell phone and laptop. At moments when you realize you're in an awkward position, make the effort to change to a better position. Once i started doing this, I stopped getting neck pain.