I've noticed that straight after using Siri, it makes the phone sounds annoyingly loud! If the phone is in sleep mode, and I use Siri... when I unlock the phone, the unlocking sound is VERY loud. If the phone is already unlocked and I use Siri, then whatever I do immediately results in VERY loud sounds. For example, if I start typing a text message, the key clicks are extra loud. I have to exit the message app and open it again for it to go back to normal. Is anyone else experiencing this? or have I got a dud 4s??!