I recently met with Olaf Swantee, the head of Orange Mobile, a large telco owned by France Telecom.
Mr Swantee said sustainability and the availability of spectrum were two key challenges.
Other highlights from the interview:
-WiMAX is not seen as a solution to spectrum issue.
-iPhone customers use about 90 MBytes of data per month compared with just 30 KB for regular customers, this is putting pressure on building larger data infrastructure.
The full interview is here: