My house phones are fully charged but I can't ring out on them or receive any calls. My internet is working fine though. Does this mean there is a problem with my actual phones or could it be an exchange problem. If it is an external fault do I phone BT or my phone provider? Thanks.
as you say your phones are charged I assume they are cordless? if so try a wired phone plugged into the master socket.
(with the cordless phones you can also try paging the phone from the base unit to check they are paired ok)
Impossible to say if it's a problems with your phones or the exchange from the information you've given, but it's the phone provider you have a contract with, not BT, so you'd phone your provider.
or goto a phone box or ask a neighbour to dial 150 (free call) and do an automated line test will also give advice how to do further tests before calling an engineer.
had a similiar issue a few years ago and the BT man explained that the broadband system can work on just one connection unlike the phone that needs 2. Turned out to be a part break in the cable outside the house but the broadband still worked threw me completely.