If you go to Vonage V Access website you can get a local number that you can call for free via vonage that then lets you enter in another vonage number or 800 number (seems to work for 877 too) which you can then call. Our standard vonage plan only has 500 minutes and doesn’t have unlimited access (we’re on the $15/month plan rather than $25 which is unlimited) so this trick is useful when calling people like Sprint and sitting on hold for ages and not using up any minutes in the plan (Our local number is 614 334 9472)
I could have used my Verizon cell (which is unlimited at weekends) but that doesn’t have a very good speakerphone, whereas the landline has a good speakerphone to listen to hold music with.