Dial-up wireless router

Those in inner city areas with broadband access tend to forget that most of the world does not have access. I had a query from someone who could not get broadband but wanted to their dialup connection around the house. There appear to be few devices currently available to do this. They seem to have dialup included as a backup option for broadband.

There is some discussion of this online. One product I cam across was the D-Link DI 714 - Wireless router. But Iam not sure they are still available.