Why does Windows say there is no dial tone?
This happens with the modems that use Windows Dialup Networking (DUN), the message is not referring to a normal phone dialtone when using ADSL, but rather the lack of an ADSL signal. Check your ADSL modem, they generally have an ADSL or "Link" light, which, if steady green, indicates an ADSL signal is present or not. The Alcatel USB modem for example has a sequence of 9 green flashes and 1 red flash then no ADSL signal is present.
Solutions:
1. If it's a wires-only install and the activation date hasn't passed yet, this is normal, once your ADSL light goes solid green the line should work.
2. If your activation date has passed and you still get this message, check your wiring and use of micro-filters (splitters). Try unplugging all your phones and running the modem from the master socket.
3. If the connection has been previously working, check everything is plugged in correctly and then contact your ISP.