And after digging yet a bit deeper, I'd consider the following model to be 
the next iteration on the way to your MVP - note that indirect relationship 
is done via storing indexed
fwimage_id = ID(fwid)
as an attribute. This is due to the fact that

   - if you search for phones which carry some distinct image, index lookup 
   on integer attribute works significantly faster, than on string image names 
   (I'd say some 4-5 times faster),
   - if you search for details of some firmware image by it's ID() it works 
   really fast.
   
This model also allows to track movement of SIM cards between phones, and 
so on depends on what is your business need.

<https://lh5.googleusercontent.com/-Wx-Ljmg-akQ/VGs4Nw1G9CI/AAAAAAAABaw/bAoeiKqpxoU/s1600/IMEI_3.png>

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