Visionaries who speak about fourth-generation mobile technology (aka 4G) often allude to the tantalizing promise of services and features previously found only in science fiction; interactive holographic video, handheld devices with high-resolution (better than HDTV) images, streaming HD video conferencing and real-time interaction while mobile. 4G also promises a convergence between technologies, for example; mobile payments using near-field communications and handset-based smart cards, personal assistant technologies in which your mobile device will interact with networked devices and services based on your location/schedule/current actions/etc. Implementing the 4G vision of the future will require a bandwidth of at least 100Mbps, which has implications for spectrum policy not supported by current licensing and bandplans.