1. A method comprising: receiving first ambient sound information from a mobile device; receiving reference ambient sound information from each of a plurality of reference devices, the reference ambient sound information including first reference ambient sound information received from a first reference device of the plurality of reference devices and further including second reference ambient sound information received from a second reference device of the plurality of reference devices; determining degrees of similarity, the degrees of similarity including a first degree of similarity between the first ambient sound information and the first reference ambient sound information and further including a second degree of similarity between the first ambient sound information and the second reference ambient sound information; and in response to determining that the first degree of similarity is greater than the second degree of similarity, estimating a location of the mobile device based on a location of the first reference device.