We keep very little: a one-way hash of your phone number in our logs, and your last question in memory for up to 6 hours.
To have anything associated with your number deleted, send DELETE to our WhatsApp number, or email Best-FX-Rates@proton.me from any address with the phone number you used. We'll delete it within 30 days and confirm when it's done.
You can also simply stop messaging us: your last question is forgotten automatically after 6 hours.