TestComplete samples (both built-in and additional) are located in the <Users>\Public\Public Documents\TestComplete 15 Samples folder.
Some file managers display the Public Documents folder as Documents.
Mobile samples demonstrate the main approaches to testing mobile applications.
These samples are a part of the additional sample package. To use them, download this package from support.smartbear.com/testcomplete/downloads/samples and install it.
After the installation is over, you can find the samples in the <TestComplete 15 Samples>\Mobile folder.