Emergency 911 access is a concern with Residential VOIP services. Commercial services are being required to come with workable 911 plans, since VOIP services do not automatically work with 911 the way landlines do. But many services still have a long way to go to meet FCC requirements. And free services, like Skype, do not have any 911 service. Make sure you know what a provider offers for 911 access before paying out anything, and consider keeping a cheap second phone line or cell phone as a 911 back-up.