1. Whatsapp
WhatsApp is the most popular messaging app in 109 countries, according to Android device usage data. It allows you to send messages, pictures, videos and even voice recordings over the internet, rather than using your mobile network. This is ideal for iPhone users communicating with Android users, and vice versa

2.Skype
Skype is software that enables the world’s conversations. Millions of individuals and businesses use Skype to make free video and voice one-to-one and group calls, send instant messages and share files with other people on Skype. Is free to download and easy to use.
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3.Telegram
Telegram is a cloud-based instant messaging and voice over IP service. Telegram client apps are available for Android, iOS, Windows Phone, Windows NT, macOS and Linux Users can send messages and exchange photos, videos, stickers, audio and files of any type.

4.Google hangouts
Google Hangouts is a unified communications service that allows members to initiate and participate in text, voice or video chats, either one-on-one or in a group. Hangouts are built into Google+ and Gmail, and mobile Hangouts apps are available for iOS and Android devices.

5.Facebook Messenger
Facebook Messenger is a FREE mobile messaging app used for instant messaging, sharing photos, videos, audio recordings and for group chats. The app, which is free to download, can be used to communicate with your friends on Facebook and with your phone contacts.

Information here of extra apps