WhatsApp Messenger is a third-party, cross-platform mobile messaging app which allows you to exchange messages with other WhatsApp users. The only charges incurred, if any, are data charges, so it's best to use WhatsApp when you're connected to a Wi-Fi® network. There is no charge per message as, for example, with text messaging (SMS).
If you experience problems with WhatsApp or need more information about the app, visit www.whatsapp.com/faq/en/android.
Note! Sony does not warrant or guarantee the performance of any third-party applications. Neither does Sony warrant or guarantee the performance of content downloaded or acquired in other ways through such applications. Similarly, Sony is not responsible for any damage or reduced performance of your device attributable to the transfer of third-party content.