Transfer to VoIP

Has anyone migrated an old landline to a VoIP provider and also which provider are you using? Parents have had a TELUS/Shaw landline for 25+ years and rarely use it anymore, however the number itself is valuable as it attached to lots of records and accounts. They rarely ever dial out though. Was thinking just transfer the line to a VoIP provider and forward it to one of their cell numbers to save some $$.