Re: Mobile Phone Usage
IIRC people with ISDN started getting large bills when the protocol configuration chose "keep-alive" ACKs for when a connection went idle.
We had a small client that relied on a 3Com 3C891 ISDN router for the internet needs with autodialing upon egress traffic. Everything worked fine until I built them a new computer and installed Windows 98 - with automatic updates. Cue furious business owner.