I have had this issue since I started using iPhones. Whenever I run outside, or take a shower, or use the loud exhaust fan in the kitchen, etc. I have to physically check my iPhone to see if I got a call or text. It would be nice to have some type of audio alert every couple of minutes or even a flashing light to us know that there was a missed call or text. For example, I just went to the bathroom and with the exhaust fan on I didn't hear a call. So when I came out I had to check my phone to see that I missed the call, if I didn't check I would have missed it completely and never gotten back to them. It seems like a simple software thing to add a beep. There is already one about 2 minutes after receiving a text message, but it only alerts once.