Actually this article may be more informative: https://en.wikipedia.org/wiki/Greek_orthography#Digraphs_and_diphthongs
According to Wikipedia, yes. See https://en.wikipedia.org/wiki/Greek_alphabet#Digraphs_and_letter_combinations.
Properly, it should be [s], same as the Latin s. (Or English, for that matter.) However, I think it may tend toward a /ɕ/, something like the English/Romantic [ʃ] you're probably referring to. I think it make carry from PIE, which, like Modern Greek, has only a single phoneme in that whole range.
I was actually wondering if was hearing that right myself. smiles
Glad i clicked on this after learning the alphabet and quite pleased with myself, started duo. Then... dad μπ ?.. finding out the two letters make the B sound. Think this is going to be some what of a challenge but i shall stick with it. :) i will check your link Joaquin Montero Salinad
That's not really true. Many people pronounce it as "b" even in the middle of a word. For example, the word "καμπύλη" (curve) can be pronounced either "kambeelee" or "kabeelee". On the other hand, μπ can't be pronounced "mb" in the beginning of a word. It's always "b" in that case.