Owning multiple phones?

I use a Nexus5 on TMobile's $30 per month prepaid plan, & I'm thinking of getting a OnePlusOne for experimenting/testing, etc.
My questions are:

  1. Do I simply get a 2nd TMobile SIM at another $30 per month?
  2. Are SIM cards interchangeable so that one day my EDC phone is the Nexus5 and the next it's the OnePlusOne?
  3. If a 3rd phone were ever added (e.g. Project Ara), would I simply repeat the $30 plan for a 3rd TMobile SIM/phone number?

Thanks for any tips or links you can offer.

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