First up is growth. With a customer base that only rings in at 5% of the company's wireless capacity, there's plenty of room for expansion if MetroPCS can lure investors to its camp. So far, the company has done a good job of doing just that: Revenue growth sits well in the double-digits for the past few years. That said, as wireless service penetrates to nearly all Americans, MetroPCS will need to steal customers from big competitors like Verizon ( VZ ), AT&T ( T ) and Sprint ( S ) to maintain its growth in the future. At present, the company does that by competing solely on cost, but as cellular services become increasingly commoditized, MetroPCS will have trouble matching legacy carriers' margins. Right now, MetroPCS could make an attractive acquisition target for a carrier looking to add millions of subscribers to its little black book and put MetroPCS' advanced infrastructure on its balance sheet.