A method of providing telephony services to subscribers in a telecommunications system including a mobile telephone network (104, 304, 504, 704) having a subscriber database (112, 312, 512, 712), and at least another telephone network (102, 302, 500, 728) different to said mobile telephone network, the subscribers each having a plurality of associated telephony devices including a mobile telephony device, all of the devices associated with a subscriber being contactable via a device-shared telephone dialling number, said method comprising the steps of: receiving, at a call control system (110, 310, 510, 710), a first call routeing query (4d, 6c) associated with an incoming call, the incoming call being directed to said device-shared telephony dialling number for a subscriber, the call control system being located outside said mobile telephone network and comprising a softswitch; generating, at said call control system (110, 310, 510, 710), in response to receipt of said first call routeing query, a call redirect request (4e, 6d) for said call to be redirected; receiving, at said call control system (110, 310, 510, 710), in response to said generated call redirect request, a first incoming call connection request (4f, 6e) associated with said incoming call, said incoming call connection request having been routed to said call control system on the basis of said device-shared telephone dialling number; assuming control of said incoming call at said call control system; transmitting, from said call control system, a first outgoing call connection request (4g, 61) to a first telephony device (124, 324, 526, 724) associated with said device-shared telephone dialling number, said first telephony device being located in said at least another telephone network; transmitting, from said call control system, a second outgoing call connection request (4h, 6j) to a mobile telephony device (122, 322, 522, 722) associated with said subscriber; receiving a second call routeing query (4k, 6m) associated with said incoming call; identifying said first call routeing query and said second call routeing query as being associated with the same device-shared telephone dialling number; transmitting a notification (41, 6n) to a telephone switch (328, 524) located in said telecommunications system on the basis of said identification, wherein the notification includes data instructing the telephone switch to make an outgoing call connection request without generating a further call routeing query for the incoming call; receiving, at said call control system, a call connection response from one of said first telephony device and said mobile telephony device; and in response to receiving said call connection response at said call control system, connecting the incoming call to one of the first telephony device and said mobile telephony device. receiving, at a call control system (110, 310, 510, 710), a first call routeing query (4d, 6c) associated with an incoming call, the incoming call being directed to said device-shared telephony dialling number for a subscriber, the call control system being located outside said mobile telephone network and comprising a softswitch; generating, at said call control system (110, 310, 510, 710), in response to receipt of said first call routeing query, a call redirect request (4e, 6d) for said call to be redirected; receiving, at said call control system (110, 310, 510, 710), in response to said generated call redirect request, a first incoming call connection request (4f, 6e) associated with said incoming call, said incoming call connection request having been routed to said call control system on the basis of said device-shared telephone dialling number; assuming control of said incoming call at said call control system; transmitting, from said call control system, a first outgoing call connection request (4g, 61) to a first telephony device (124, 324, 526, 724) associated with said device-shared telephone dialling number, said first telephony device being located in said at least another telephone network; transmitting, from said call control system, a second outgoing call connection request (4h, 6j) to a mobile telephony device (122, 322, 522, 722) associated with said subscriber; receiving a second call routeing query (4k, 6m) associated with said incoming call; identifying said first call routeing query and said second call routeing query as being associated with the same device-shared telephone dialling number; transmitting a notification (41, 6n) to a telephone switch (328, 524) located in said telecommunications system on the basis of said identification, wherein the notification includes data instructing the telephone switch to make an outgoing call connection request without generating a further call routeing query for the incoming call; receiving, at said call control system, a call connection response from one of said first telephony device and said mobile telephony device; and in response to receiving said call connection response at said call control system, connecting the incoming call to one of the first telephony device and said mobile telephony device.