Two vendors plan service for voice calls from 11,000 Wi-Fi locations. For business travelers, it has become relatively easy to wirelessly connect to corporate networks and the Internet from Wi-Fi hot-spots. And a variety of services and products give both businesses and consumers the ability to make voice calls over the Internet. Two service providers revealed plans Monday to combine their services so business travelers and consumers can make wireless voice calls over the Internet easily from more than 11,000 Wi-Fi hot-spots.