A computer-implemented method includes: determining, by a computer device, route options for traveling between a start point and an end point during a time of a call; determining, by the computer device, whether at least one of the route options satisfies a minimum acceptable signal strength and a maximum acceptable added travel time; in response to determining that at least one of the route options satisfies the minimum acceptable signal strength and the maximum acceptable added travel time, causing the at least one route to be displayed via a user interface of a navigation system; and in response to determining that none of the route options satisfies the minimum acceptable signal strength and the maximum acceptable added travel time, determining a route including a waypoint that satisfies the minimum acceptable signal strength at the time of the call, and causing the route including the waypoint to be displayed via the user interface of the navigation system.