iPhone 4 won't play through speakers
Recently, wheneven I dock my iPhone 4 into a docking station, it will not play through the speakers. It will charge. I had this checked by the Apple Store and they said that all the settings are correct and there is no damage to the pins. I have tried docking in a Fidelio and and Sony docking station. No sound comes out through the speakers but, again, the iPhone is charging. Can anybody help with this? The Apple person suggested it maybe something to do with the Bluetooth but I've turned that off and on, and it doesn't make a difference. Thank you for any help or suggestions.
iPhone 4