Unique widget callback.
Request a call back takes a special program on your Android Smartphone.
The number of calls is unlimited.
Calls are made through GSM connection, respectively, the cost of the call will be equal to the cost according to the rate of your GSM operator.
Fee $3 a month per operator.
To use the application, register on the site http://widgetcall.com/
Installation instructions on the link http://widgetcall.com/install