The problem with a lot of VoIP calling services is that they are not necessarily friendly to those who aren't tech savvy. You have to train them to do something differently they already know how to do: make phone calls. They also have to sign up for a service on a website and possibly install software.

MOBIVOX is about to launch a service called GiftVOX-just in time for the holidays-where you can sign up anyone, preload their account with credit and contacts, and look up a local access number. Then you call your loved one and give them their local access number. The loved one calls the local access number and simply tells MOBIVOX who they want to call. About as Grandparent-proof as it gets.