EntityQ1244156· pop 5· linked from 8 articlesCarrier preselectSign in to savelandline telephone option that lets European customers use a third party for call chargesConnectionstelecommunicationsEntitymonopolyEntitytelephonyEntityBT GroupEntitybusiness telephone systemEntitylocal-loop unbundlingEntityleast-cost routingEntityTalkTalk GroupEntityCategoriesBroadbandLocal loopTelecommunications economicsTelephone exchangesTelephonyTeletraffic