Google has got itself into hot water with Apple after using private iPhone APIs to develop an update to its Google Mobile iPhone package.
The updated package made it to Apple's App Store before the API (application programming interface) violation was discovered.
Google now admits to breaking the official rules of Apple's iPhone software development kit (SDK).
The Google Mobile iPhone application uses undocumented APIs in order to use the iPhone's proximity sensor to prompt a verbal search on the device.
But iPhone developers are supposed to use only the APIs that Apple has published in its SDK when creating their applications under the terms of that agreement. And the API to make the Google voice search possible is not in there.
A problem with using undocumented APIs is that application code could break as Apple updates its software.
So far, Apple has not said how it will deal with the third-party development breach.