Telecom is a capital-intensive business. Having the resources to maintain and improve the network is critical to success.
Telecom is high fixed-cost business. Keeping an eye on margins is very important.
Watching debt is also important. Firms can easily overextend themselves as they build networks.
The price of wireless airtime is plummeting. Carriers continue to compete primarily on price.
Ref: The Five Rules for Successful Stock Investing by Pat Dorsey
Investor's Checklist: A Guided Tour of the Market...