Akamai Technologies is the newest member of the Mad Money Mobile Internet Index, Cramer said on Tuesday. The index, of course, is his proprietary exchange-traded fund, which tracks his favorite smartphone-related stocks, and he thinks AKAM makes the perfect addition.

This is an Internet infrastructure play, as Akamai’s platform speeds up and improves the delivery of all kinds of content and applications over the Web, including mobile networks. Think: everything from Web sites to streaming video to e-commerce tools. Ever used MLB.com? That’s Akamai. It’s this ever-increasing demand for bandwidth that bodes well for the company’s future, and it’s the reason Cramer likes the stock.