Several other physicians, myself included, have posted about the problems with text message alerts. The alert is very "soft" and I can have my phone in my purse or pocket and not even know that I have received a text/page. If there is ambient noise, etc, it is a problem. I have gone back to using my beeper more. I have submitted suggestions several time on the apple link. I know that S. Jobs said this thing is for personal use not business, but I think that receiving texts ought to be something that we can hear, hear consistantly, and not worry about missing. I have also missed an important personal text from one of my teenagers.
I LOVE my iphone but have issues with the volume of texts, the volume of the ring (have missed calls from my answering service as well as texts) and still have problems with volume from the speaker and the ear volume. It continues to make no sense to me, as I can crank up the ipod volume until it is way too loud.