Intelligent subscriber identity module (SIM) switching for user equipment (UE) devices is disclosed. The UE may have multiple SIMs for multiple carrier networks (i.e., mobile network operators (MNOs) that provide wireless network infrastructure, such as radio access networks (RANs)) or a universal SIM. It may be desirable to switch between SIMs for various reasons, such as based on network quality criteria, subscription criteria, agreement criteria between MNOs, etc. These criteria may inform a policy for determining which SIM to use.