Google Voice

People that have multiple devices might have a difficult time using all of them in an efficient way. This where the Google Voice application comes into play. For example, since the app also comes with its own telephony number, it’s possible to connect all the other phones to it and use it’s voice messaging system.
This feature works in reverse as well, meaning that if you have three phone, people don’t have to call all three of them and leave three different messages. Furthermore, it’s possible to read a transcript of the voice message, reply with a text to it, or even listen in while the message is still being recorded.
Furthermore, it’s even possible to call other people using the number, but the tariffs different from country to country.