Google neglected to mention the big catch to its new wireless service

Google Inc. ’s planned wireless service may launch by the end of March, but it will work only on the company’s latest Nexus brand smartphone and not on other phones using Google’s Android operating system, people familiar with the matter said. The service, designed to switch among Wi-Fi and cellular networks, will initially be available only on the latest Nexus 6 smartphone designed by Google and made by Motorola Mobility, a former Google unit now owned by China’s Lenovo Group Ltd. , two people familiar with the matter said. One of the people said the service won’t work with older Nexus devices, such as LG Electronics Inc. ’s Nexus 5. Google executive Sundar Pichai on Monday confirmed plans for a wireless service, the latest sign that Google’s ambitions extend beyond selling ads and services over the Internet to influencing how Internet access is delivered. People familiar with Google’s plans said it expects to launch the service in coming weeks, but the start may be delayed.