Hi AFAIK In This Issue #5992 Iran Censored Signal and It Seems Problem Solved Here #6006
As We Can See In This Link :
elliptic1@af0ff7d
But I Installed v 4.1.0 From Google Play Recently And When Try To Enter My Phone Number and Receive Message The App Shows Me "Signal Was Unable To Connect To The Server".
The Problem Solved When I Used L2PT VPN USA Country.
This Mean Unfortunately Iran Censored Signal Again So Please Solve This Issue Again.
Thanks In Advance