Work A rounds - Your results may very.
On My I phone 4S as I have stated previously which has the latest OS upgrade I lose internal speaker audio when I disconnect the Iphone from my car docking port.
As soon as I disconnect it the music stops. If I go to "Pandora" it displays a message saying that there is a Problem and Pandora can not start.
If I try other internal speaker programs I get no error message and no audio. Basically the app just does not play but at least for testing Pandora displays a message when I am experiencing internal Speaker issues.
As work arounds I found:
1. Reboot the iphone - Press and hold both the off power button and the home button simultaneously until the phone shuts down and than after a period of time press the power button to wake it up. After the reboot the internal speaker will work, Pandora will work off the internal speaker and I will not see the error message with Pandora., Kind of a PITA way to have to do it 😟
2. For some reason I have a beat up old taped together Dock that if I place the phone in it after taking the phone out of the car docking port the internal speaked starts working again. Nice when I am near the beat up dock but it is not always available. I think the internal resistor in the beat up dock is shorted out and this helps the IPHONE interrmal speaker to get renabled.
3. Just found this out today and it may not even work again for me. - Instead of removing the Iphone from the car docking port after turning off the ignition and the phone music app pausing. I instead pull the phone out of the docking port while the car is still running. I found the internal speaker started playing instantly and kept playing. And no Pandora error message.
These work arounds have worked for my iPhone but not sure if they will help anyone else so I am just throwing them out there until this issue gets fixed by Apple. - One can only hope 🙂