C. Back Monitor Module
The back monitor module is divided into a phone
answering module and a short message receiving module.
When a call enters, the answering module will interrupt the
current operation and the user has two options, namely
answering or not; therefore, only two mobile phone position
statuses are needed. When a short message enters, the phone
will automatically enter short message play module if the user
doesn't perform operation and the user should press
confIrming key for answering; when the user is operating, the
phone will only give voice prompt without interrupting;
therefore, pressing key is not needed. The user can enter the
short message play module to read the short message after
completing the current operation.