Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine that the UE is operating using a first subscriber identity module (SIM) in a non-standalone mode associated with a first radio access technology (RAT) and a second RAT, and that a second SIM has been activated for the UE. The UE may determine, based at least in part on user input, whether to operate in a multi-SIM mode, where both the first SIM and the second SIM are active, or to operate in a single SIM mode where only the first SIM, and not the second SIM, is active. The UE may selectively deactivate the second SIM based at least in part on determining whether to operate in the multi-SIM mode or the single SIM mode. Numerous other aspects are provided.