Has anyone else noticed this? The ringer on my 4S is considerably quieter than it was. A friend of mine who works for Apple has noticed it, and I have noticed it too when I've been on the train with other iPhone users and have been able to hear their iPhones ringing, but not my own. I have slept through the iPhone's ringer three times since updating, and that was never the case before in over three years as an iPhone user. I've done all the really obvious things to save embarrassment, including checking the volume of the ringer and alerts, and it's all as it should be. So I'm out of ideas. any thoughts welcome.
PS: I did think it might be a speaker problem, but a friend of mine has also experienced the same issue and besides, there is no problem with any other sounds on the system.