Without Clearwire (CLWR -0.6%), Sprint (S +1%) would have to pay out $5B to upgrade its own...

|About: Sprint Corporation (S)|By:, SA News Editor

Without Clearwire (CLWR -0.6%), Sprint (S +1%) would have to pay out $5B to upgrade its own towers to be 4G compatible. Clearwire is still raising money to complete its 4G network. This leaves Sprint's current $5B infrastructure improvement project facing uncertainty, and Sprint's still on the hook if Clearwire defaults.