A smartphone can reduce power consumption when located in a low service coverage area by determining whether to scan for service based on a screen status of the smartphone. However, in some cases, screen activation does not imply the user is initiating smartphone use, such as when the screen is activated in response to an alarm or a reminder triggered by an application. Smartphone power management is improved by using a proximity sensor to determine whether to initiate a service scan, as well as the type of service scan to initiate.
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Telang, Mahesh and Nayak, Shivank, "Enhanced OOS Recovery Mitigation During Screen Status Change", Technical Disclosure Commons, (April 09, 2020)