How do I start focusing on web design for phones?

I am an entry level web designer, and I always read on job descriptions that they are looking for developers that can create websites that not only look good on a computer, but also good on a phone. At least that is how I understand it. Does anyone know how I can get started on web development for mobile phones?... show more I am an entry level web designer, and I always read on job descriptions that they are looking for developers that can create websites that not only look good on a computer, but also good on a phone. At least that is how I understand it. Does anyone know how I can get started on web development for mobile phones?

Thanks
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