ok 2 different separate things to check.
1) The phone
2) The broadband
you can skip the home wiring by testing all from the test socket in your house
* Plug just the phone into the test socket.
* Make sure you can call out and call in. If there are any problems doing so then the phone line is possibly at fault.
* Borrow someone else's phone and repeat. If this still does not allow correct calls in & out, then the phone line is at fault and you need talk talk to fix.
* When you make the calls, do you get any popping or other non call noises on the line. If you do then the phone line is faulty
* Try the broadband connection in the test socket without the phone. Do not use a Filter
* Check this makes a connection and attaches to the Internet. You can see this from the routers web interface
* You know the physical telephone line is ok, as you have just tested this, so if it does not connect then its possibly the router
* Default the router (make sure you have the settings) and reset it up and retest. If you still fail to connect then it could be the router or it may be a fault at the BB provider.
* Get a loan router from a mate and set for your BB provider. If this works then its your router at fault, if it is still broken then its the BB provider and you need to get them to reset fix their equipment. (note: it can take 10-30mins to kick in so be patient)
* If the BB router is working, try your BB splitter filter now. This checks the filter is ok or not. You can plug the filter into the test socket and the BB into the filter. Do not put the phone in yet.
* If this works then put the faceplate on and test that with just the BB router. This checks the face plate, home wiring is working.
* Again add the filter now. If this filter stops the BB from working then you need a new one.
* Finally add in the phone. If now it fails you have a problem with the Phone/BB router together causing a fault. Time for a new one of these.
Hope that helps.