You have to turn on the chat cheats setting in the game files, I'm not entirely sure how to enable that directly on android, but you could send me your save file and I could do it for you if you so wish.
Once that setting is available it's as simple as tapping the date box to open it I believe, just don't use any of the actual cheats (or do but be careful as they can ruin the integrity or actually ruin some parts of the game, they're pretty expansive)
It is a mobile multiplayer feature and not yet perfectly flushed out (bit awkward with tap to move, otherwise perfect), but it functions perfectly as a chat so it's pretty good if you ask me