Sprint's latest customer increases still don't show the company operating from a position of strength. If Sprint wants to get strong, reliable sources of revenue, it's going to have to start growing its postpaid customer base.

The short answer is that no one knows exactly, yet. In June, AT&T announced tiered wireless data plans shortly before the launch of the iPhone 4. Existing subscribers could continue with unlimited plans, but new customers have to choose between DataPlus, $15 a month for 200MB of data traffic or DataPro, $25 a month for 2GB. AT&T says the two plans cover 98% of current customers, 65% of whom currently use less than 200MB.

Like many things in IT, this security convergence is a work in progress. But as wireless LANs become the primary connectivity for more enterprise users, integrating wired and wireless becomes more pressing, especially around security.