Crashpad,
Samknows says that only BT wholesale, BT wholesale max
Which means every man and his dog should be able to reach you (Zen, Nildram etc.)
Perhaps your problem is your distance from the local exchange. Some providers public checkers will say "no service" because of the distance from the exchange, simply due to the fact that although theoreticallly achievable, in practice, sites that are far from the exchanges are a right pain in the neck ! In the residential market, the ISPs want easy volume, not troublesome individual cases.