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We answer within 3 working days at the latest. If you're writing about a technical problem, it helps a lot to know your iPhone model, your iOS version, and what you were doing when it happened.
Your birth data travels with you only if you signed in before switching devices. Sign in with the same Apple or Google account on the new phone and it will be restored. If you never signed in, the data only ever existed on the old device and will need to be entered again.
Open Settings inside the app and tap Restore purchases. The subscription belongs to your Apple ID, so it comes back after a reinstall or a new device, as long as you use the same Apple ID you bought it with.
From iOS, not from Astrae: Settings → your name → Subscriptions → Astrae → Cancel subscription. We cannot cancel it for you, because Apple manages it.
Settings → Edit profile. The whole chart is recalculated with the new value. Bear in mind that changing the time moves your ascendant and your houses, so a good part of the texts will change too.
Settings → Delete account. It is immediate and irreversible: your account, birth data, connections and generated texts are all removed. Remember this does not cancel your subscription, which is cancelled from iOS as explained above.
You can still use Astrae. The Sun, the planets and most aspects are reliable without the time; what we can't place precisely is your ascendant and your houses, which are exactly what moves most over the course of a day.