16. A system for inferring a high-level context associated with a mobile device, the system comprising: means for accessing low-level context information for each of a plurality of other devices, wherein location information associated with each of the other devices indicates a proximity to a location of the mobile device, and wherein the low-level context information for each of the other devices is based on data collected by a sensor of the respective other device; means for aggregating the low-level context information across the plurality of other devices; means for comparing the aggregated low-level context information to a plurality of templates, each template being associated with a high-level context and including one or more histograms of context data; means for determining match scores between the aggregated low-level context information and each of the one or more histograms of context data; and means for transmitting, to the mobile device, a multi-device statistical summary comprising the aggregated low-level context information and the match scores; scores and the mobile device comprising means for inferring a context based on the multi-device statistical summary and additional data not included in the multi-device statistical summary.
16. A system for inferring a high-level context associated with a mobile device, the system comprising: means for accessing low-level context information for each of a plurality of other devices, wherein location information associated with each of the other devices indicates a proximity to a location of the mobile device, and wherein the low-level context information for each of the other devices is based on data collected by a sensor of the respective other device; means for aggregating the low-level context information across the plurality of other devices; means for comparing the aggregated low-level context information to a plurality of templates, each template being associated with a high-level context and including one or more histograms of context data; means for determining match scores between the aggregated low-level context information and each of the one or more histograms of context data; and means for transmitting, to the mobile device, a multi-device statistical summary comprising the aggregated low-level context information and the match scores; scores and the mobile device comprising means for inferring a context based on the multi-device statistical summary and additional data not included in the multi-device statistical summary. 18. The system of claim 16 , further comprising: means for estimating a time context of the mobile device, wherein the mobile device is estimated to be in the time context and at the location simultaneously, and wherein each of the plurality of other devices is estimated to be at the respective proximity during another time context, the time context and the another time context being the same.