Yes, I am totally agreed with u that it can't be compare with DSL, and can be use for checking mail and other small task.
and both are totally different thing.
DSL gives 90-110KBps and vfone gives only 18Kbps.
Dsl requires land line. Vfone wirelessn can be use anywhere.
Dsl can be use 24*7, but vfone become hot after using long time.