My day job has involved phones and smartphones for several years. It's never made any sense. I wonder if it's intentionally confusing.
Manufacturers often use a meaningless jumble of numbers and letters because they selling in many different territories with different languages. See also cars.
I know that Nokia have reused the same 4-digit model number for completely different generations of phones, which is just unhelpful to everyone, really. They must have had some old boxes to reuse, or something.