OneTime: The Best Ever Messenger App For Android Devices.

There are wide number of messenger apps which can support your android device, but OneTime is the best and more secure one. OneTime uses your phone’s Internet connection of any type such as 4G, 3G, 2G, EDGE or Wi-Fi to send and receive messages to your friends and family. You do not have to pay for every message. Video Calling works in the same way but you need at least a 3G or even better a Wi-Fi connection. If your phone is roaming, additional mobile data charges may apply.
Your OneTime account can only be registered with one number but you can use it on other devices as tablet, iPad, Desktop or even another phone using the multiple device code. With the multi device code they can link your other devices to your phone number that is already registered. You don’t need a sim card in your other device to use OneTime you only need an Internet connection on your device.
When you download OneTime, the app is connected to your Google Account or your Apple Id respectively. This means you can reinstall the app to new or reset devices without purchasing it again and get all future updates without additional payment. If you can't find OneTime you previously purchased or you're being asked to purchase OneTime although you already bought it on Google Play, make sure you're signed in to the same account as when you made your purchase. If you deleted OneTime and now want to install it on the same phone again you need to make the same steps as for the initial registration, you cannot make use of “Already have an account” option.
The company has its official website which you may visit to read more about the process and charges applied.