A user equipment (UE) in a wireless communication network performs early determination of SIM switching to mitigate delays in SIM switching typically experienced by the UEs when a no-service event has occurred. During frequency band scanning for a carrier network associated with a primary or current SIM in use by the UE, the modem provides an available network indication(s) to an early SIM switching component of the UE, such as a local profile assistant, indicating that a different carrier network has been detected. Responsive to receiving the available network indication from the modem, the early SIM switching component directly switches to another SIM associated with the detected carrier network without having to wait for the UE to scan each remaining frequency of the original carrier network, scan other frequency bands of the original carrier network, or repeat the scanning process for a different SIM associated with a different carrier network.
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Chen, Edison, "Early Determination of SIM Switching in Mobile Telecommunication System", Technical Disclosure Commons, (December 21, 2021)