Systems and methods for characterizing a performance of a wireless network. Data or metrics are collected from a device. The metrics include timing information associated with certain sectors. The timing information can be used to determine an approximate location of the device when the call or other use of the device occurred. A device rating is used to contribute the metrics of the device to bins of a grid that describes the wireless network. Only the bins associated with the approximate location of the device receive the contribution of the metrics. The metrics from other devices are similarly contributed to specific bins. As more usage of the devices occurs, the bins reflect the performance of the wireless network. The device ratings of the devices can also be updated based on the bin ratings and other data associated with the bins.