When two people install and use this app on their smartphones, they can easily use a collect call service as if they use a regular phone.
In order to use this application, you need to be connected to the internet via network (eg Wifi, 3G, LTE, ...).
* Note *
Wifi may not be able to receive collect call requests because the operation is stopped by battery saving mode after a certain period of time after the smartphone screen is turned off.
* Additional Information *
If you use the "Missed Call Alert" app instead of the "Smart Collect Call" app, you can expect more reliable operation. (See the "User Message Alert" feature in the "Missed Call Alert" app)