You may already have good enough number of Voicemail systems/apps and don't need any more. But depending on where you live, this "Simple Voicemail" may help you. This app is little different from similar apps in Android Market.
-It is not tied to any carrier's propriety system.
-You don't need to sign up or register to new service which you may feel unsecure. It uses your Gmail address only.
-Voice message won't go through 3rd party server which you may feel unsecure, it goes from your device to target Gmail server directly. (I provide app but don't run service.)
-Since sent/received voice messages are left in Gmail server so you can access them with various ways including PC.
This app utilizes Gmail but it won't ask you to use Gmail app for basic operations.
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