Voice messages: 0.9–1.2 KB per second
Text messages: Approximately 1 MB for every 1,000 messages
Image messages: Compressed to 50–200 KB per image, depending on original quality
Video messages: Compressed to 20–30 KB per second, depending on original video quality
Short videos (Moments/Videos): Compressed to around 75 KB per second, depending on original video quality
Uploading contacts: 2 KB per 100 contacts