How many phonemes in the word unnecessary?

Let's break down the word "unnecessary" to count its phonemes:

* Un - /ʌn/ (one phoneme)

* Nec - /nɛs/ (two phonemes)

* Ess - /ɛs/ (one phoneme)

* Ary - /əri/ (two phonemes)

Adding these together: 1 + 2 + 1 + 2 = 6 phonemes.