It's like the oil companies. Create an artificial shortage, & charge more,
when you need more money. Anywho here's a rate comparison.

AT&T and Verizon iPhone plans compared | Phones | iOS Central | Macworld

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Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….