Periodic registration updates for multiple SIM user equipment

A system comprising:

• a communication interface;
• controller logic in communication with the communication interface, the controller logic operable to:
• identify a update transition time that occurs during an active first SIM connection, to transition the communication interface to a second SIM to perform a registration update communication with a network controller that supports the second SIM;
• and
• when the active first SIM connection comprises a voice call connection:
• maintain the active first SIM connection instead of transitioning the communication interface to the second SIM;
• and
• when the active first SIM connection comprises a data packet connection:
• transition the communication interface to the second SIM at the update transition time.

A system comprising:

• a communication interface;
• controller logic in communication with the communication interface, the controller logic operable to:
• identify a transition time that occurs during an active first SIM connection, to transition the communication interface to a second SIM to perform a registration update communication with a network controller that supports the second SIM;
• start a guard timer at the transition time;
• transition the communication interface to the second SIM at the transition time;
• and
• when the guard timer expires or when the second SIM completes the registration update communication:
• transition the communication interface back to the first SIM.