A computer-implemented method comprising: operating a mobile device in idle mode; establishing a long term evolution, LTE, radio link between the mobile device and a cell site within communication range of the mobile device; evaluating a first criterion of a plurality of criteria, the plurality of criteria being: whether the mobile device does not support voice over long term evolution, VoLTE, for communicating with the cell site; whether a VoLTE capability of the mobile device has been turned off; and whether the mobile device does not support making a call to an emergency services telephone number using VoLTE; in response to determining that the first criterion is not met, evaluating a second criterion of the plurality of criteria; in response to determining that the second criterion is not met, evaluating a third criterion of the plurality of criteria; in response to determining that the third criterion of the plurality of criteria is met: monitoring a timer to determine whether a time period has expired; upon determining that the time period has expired, scanning for availability of legacy radio coverage from a legacy radio access network; determining , based at least in part on the scanning, that the legacy radio coverage is not available to the mobile device; and in response to determining that the legacy radio coverage is not available to the mobile device, providing an indicator on the mobile device indicating that the mobile device does not have voice service capabilities. operating a mobile device in idle mode; establishing a long term evolution, LTE, radio link between the mobile device and a cell site within communication range of the mobile device; evaluating a first criterion of a plurality of criteria, the plurality of criteria being: whether the mobile device does not support voice over long term evolution, VoLTE, for communicating with the cell site; whether a VoLTE capability of the mobile device has been turned off; and whether the mobile device does not support making a call to an emergency services telephone number using VoLTE; whether the mobile device does not support voice over long term evolution, VoLTE, for communicating with the cell site; whether a VoLTE capability of the mobile device has been turned off; and whether the mobile device does not support making a call to an emergency services telephone number using VoLTE; in response to determining that the first criterion is not met, evaluating a second criterion of the plurality of criteria; in response to determining that the second criterion is not met, evaluating a third criterion of the plurality of criteria; in response to determining that the third criterion of the plurality of criteria is met: monitoring a timer to determine whether a time period has expired; upon determining that the time period has expired, scanning for availability of legacy radio coverage from a legacy radio access network; determining , based at least in part on the scanning, that the legacy radio coverage is not available to the mobile device; and in response to determining that the legacy radio coverage is not available to the mobile device, providing an indicator on the mobile device indicating that the mobile device does not have voice service capabilities. monitoring a timer to determine whether a time period has expired; upon determining that the time period has expired, scanning for availability of legacy radio coverage from a legacy radio access network; determining , based at least in part on the scanning, that the legacy radio coverage is not available to the mobile device; and in response to determining that the legacy radio coverage is not available to the mobile device, providing an indicator on the mobile device indicating that the mobile device does not have voice service capabilities. <EOS>