I have the newest update on my android phone and when I get into a mission I can chat. People will say hi and I'll say hi back, but later on in the game I can't chat at all, and I can't delete any mistakes.
The keyboard will come up, but when I type the letters, nothing shows up. Therefore I just don't try to chat anymore, and I'm sure people think either I turned off chat, or I'm just rude.