How to Get New Message as Popup Window on Galaxy S5
You can view your new text message as a popup on Galaxy S5, so you don't have to open the Messages app each time you receive a new message. To ...
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If you want to hold a track of your sent and received text messages on your Android device, during a period of time, you need to install an app. Count SMS (both sent and received) on Android by downloading and installing SMS Counter from Google Play.
The app is really easy to use and it keeps the statistics of your incoming and outgoing messages. Daily, Month and Custom report is also possible.
If you own a HTC One and want to keep track of your messages, see: How to Count Messages on HTC One