Bandwidth usage

So you ve a limited internet download usage type of connection? It can't be calculated on an hourly basis, the more you speak, the more you upload, the more your friend speaks, the more the download. When you don't speak anything, nothing is downloaded. So I would say it's variable. Bandwith is the speed. For smooth talk, I think you will need about 128kbps line.

Use Broadband for better clarity

The bandwidth required for simple text chat is less than as compared to voice or video and it depends on each messenger service and also on the length of message string