To fulfill the vision of the Future Internet a ubiquitous deployment of IPv6 is a necessity. The work presented in this paper combines networking technologies and mobile software application development to support interworking of mobile devices and smart objects. We report on the implementation of an Android IPv6 smartphone that interworks with Web-enabled wireless sensors in the Internet of Things. This includes a possible network setup for IPv4/IPv6 interworking by using a public tunnel broker service. The demonstrated solution is universal, since the Android device can be connected to any IP network, even where a Network Address Translation (NAT) device is deployed.