The data screen that tells you the truth
Most apps answer "how much data are you using" with a number somebody's server guessed. Cyca counts it on your phone, at the points where bytes actually move.
Measured, not estimated
Open Data Management in your profile and you get a small matrix: media and chat, against sent and received. Media transfers know their own size. A chat message's wire size is its body plus a small fixed envelope. Nothing there is a server-side estimate of what your phone probably did.
It says when it started counting and that it is measured on this phone, because a figure without a start date is not a figure. You can reset it whenever you like.
There are no controls on that screen, on purpose. It is not a transfer feature. It answers one question and stops.
The cache is yours
Underneath, the media cache on this phone, with its real size and a button to clear it. Photos and voice notes are kept on the device so a conversation opens instantly and still reads with no signal — and when you want that space back, you take it.
Two requests, in plain words
Request my collected data — a copy of everything your account holds. Request data deletion — erase your data without closing your account, which is a different thing from leaving and should not be buried inside it. Closing the account entirely is its own control, kept separately so neither can be hit by accident.
Both are handled by a person over email today, and we say so on the screen, along with the fact that it can take up to thirty days, as the law allows. A dialog that promises an instant export and then quietly opens a ticket is worse than one that tells you what actually happens.
There is also a plain-language note about exactly what gets deleted, one tap from the request itself — not a link to a policy you have to read sideways.
None of this is a feature we expect anyone to use often. It is there so that the answer to "what do they have on me, and can I get it back" is a screen, not an email you never send. The privacy policy covers the rest.