Maybe because you hold important work conversations or maybe because you're just very wary of your personal information and privacy, but you might be interested in making use of a service that guarantees the privacy and integrity of your text messages and multimedia contents when exchanging them over instant messaging applications. If so, you can download XLock - Encrypted cloud for text messages free for iPhone.
The app that teaches you how to encrypt your chat conversations
It's an app that allows you to backup your chats on the cloud, blocking their access by means of different methods, including fingerprint identification. In other words, you can store conversations and access them by simply scanning your finger or inputting a password. However, you must remember that if you decide to download this software, it only adds a lock to the conversations you choose within the different apps, not to all of them.
WhatsApp Messenger, Facebook Messenger, iMessages... protect the access to your most important conversations.
Although you can download the application for free, this service comes along with an automatically renewable monthly subscription that offers us 5 GB of storage space on the cloud. Using XLock is very simple, only need to choose those messages that you want to store safely to send them to the app.