Imo is a free, simple and fast video calling and instant messaging app. Send text or voice messages or video calls with your friends and family quickly and easily, even signal under bad network. Supports real-time group video chats for up to 20 members. Enjoy live conversations with colleagues, friends and families, create a conference room for online meetings, and send large videos or documents as you like. It's the perfect tool for organizing an online party or working from home. Compatible with all networks: free, unlimited instant messages and audio or video calls over 2G, 3G, 4G * or Wi-Fi. Consistent and stable audio calls even with 2G network! Avoid charges for SMS and phone calls, no fees or subscription for every message or call.
Supported Android Devices : [4.0.3–4.0.4] Ice Cream Sandwich - [4.1–4.3.1] Jelly Bean - [4.4–4.4.4] KitKat - [5.0–5.0.2] Lollipop - [6.0 - 6.0.1] Marshmallow - [7.0 – 7.1.1] Nougat - [8.0-8.1] Oreo -  Pie