Hi,
Not sure if this is the right place, but here goes...
While signed in to "Self-serve", under "plans and Add-ons", then under "change SIM card" I think there should be the option to switch between activated SIM card profiles; and then detailed information for each like Device type, Device Model, OS, IMEI, SIM Type, SIM number and most importantly Currently activated/ Registered SIM. This way you can make full use of the multi-card SIM that is offered and at the same time switch between different devices to test out calls, texts, data and just how well your various devices function with the services.
What do you guys think?