WhatsApp is a cross-platform messaging service that uses the same internet data plan you use for email and web browsing, there is no cost to message and stay in touch with your friends.
Only Internet is needed during chat.
Here you will see when the last time your WhatsApp was backed up on iCloud.
Chat with your friends all over the world as long as they have WhatsApp Messenger installed and avoid those pesky international SMS costs.
Try it out by swiping up to lock a recording, and then tap the "pause" and "resume" buttons.
What about being able to delete what you sent on both sides nit just from my chat, it used to not any more! Presently you can add contacts from which you need to convey on WhatsApp.