Type in the box at the bottom and press Enter (or the arrow). Shift+Enter starts a new line. You can turn Enter-to-send off in Settings > Conversations.
Under your texts you see ticks: sent, delivered, then read in green. While they write you see the typing dots.
When a Zoi hasn't answered yet, the ticks on your last text tell you why: lilac with a dotted tick means they haven't looked yet, lilac with a little z means they're asleep, and green means they read it and haven't replied.
A small spark beside your last text shows how far it got: dashed grey while Dreami gathers your texts, lilac with dots once the AI has them, red if they could not be sent. Tap a red one to try again. It goes away when the reply comes.
A badge on the hub tile and a banner tell you when a Zoi texts while you are in another screen.
Zois can write bold words. A stressed word shows in colour, because the phone's font has no italics.
Zois text at their own pace. The typing dots come and go while they write, and they may send a few texts in a row, or just one. Asleep or busy, they see your text later. Upset, cold with you or in a strong mood, they may leave you on read for a while. Most of the time they answer.
Read, but no answer yet. They might reply a while later, when they have time.
Leaving their texts unanswered is noticed too, and it fades again over a few days. See How Zois feel about you.
Now and then a small thought cloud appears under a text. It's what the Zoi didn't say out loud. Tap it to open it.
A thought cloud under a text. Tap it to open what they didn't say out loud.
TipTexts you send while a Zoi is still answering join the same reply. Dreami waits about 5 seconds after your last sent text before it asks the AI, so you can send a short burst of texts.