This is something that I noticed in Taiwanese Mandarin TV series and films. It seems that they pronounce this character as hàn instead of the commonly accepted hé. For example, 我和你 is pronounced wǒ ...
Was talking to my friend (native Chinese) the other day and when she read out a phone number she said "yao" for all the "ones" in the phone number. However, as far as I remember, for all other cases ...