When migrating from older analog telephone service to newer VoIP service, there are various issues to consider before canceling your old account.
Do not cancel your old phone service until all your important phone numbers have been completely ported from your old service provider to the new digital service.
Do not cancel your old phone service until all your important fax numbers have been completely ported from your old service provider to the new digital service.
Do not cancel your old phone service until you have confirmed that your security alarm monitoring service is using 'cellular' (wireless) monitoring.
Do not cancel your old phone service until you have confirmed that your credit card processing terminals will function properly without an analog phone line.
Do not cancel your old phone service until you have confirmed that your postage machine will function properly without an analog phone line.