Just let me stop you right there as I reiterate what Apple App Store has to say about HalloApp and its privacy:<p><pre><code> Data Linked to You
</code></pre>
The following data, which may be collected and linked to your identity, may be used for the following purposes:<p>* Contact Info<p>Phone number (your most prized privacy info). This is a FULL-STOP right there in these days and ages.<p>* Contacts<p>Contacts (your entire address book, who would want to pull down the proverbial pants and leave their derrière exposed and tangle with the wind?)<p>* Identifiers<p>User ID (probably your Apple ID, after sufficient reverse mapping).<p>* Diagnostic<p>Crash data, not hard to get even more relational mapping from this.<p>#############
# Signal<p>Compare that to SignalApp:<p>* Contact Info<p>That is entire optional and can be left blank within the Settings->Contacts->My Card of which that should always be blank.<p>Nothing to see there, move along.