The articles aims to shed light on the phonological sstatus and the pronunciation of the glottal plosive in the spoken variants of Modern Persian found in Iran. It is based on recorded interviews with 24 persons, aged between 20 and 80, 16 living in Iran and 8 living in Sweden. Conclusions: the glottal plosive does exist as a phoneme in Persian, but its pronunciation in Arabic loanwords depends on a number of factors such as phonological environment, semantic field of the word, speech situation, individual variation etc.