Problem description
Potentially Device Swap API could provided 2 distinct information:

• Request last Device Swap date (When was the last device swap for the mobile line identified by the phone number +123456799?)
• Check last Device swap by providing a delay (Does we had a device swap for the last 240 hours for the mobile line identified by the phone number +123456799?)

In order to move forward on the API design we should discuss on following questions

1. Are we sharing same expectations of the API?
2. Are we considering this information as independent one from the other ? We can have different privacy requirement, different way to commercialize it. Technical implementation feasibility should be considered.
3. How multi-SIM can affect this design?

Possible evolution

Alternative solution

Additional context