Apart from that, take a look at https://bkil.gitlab.io/secuchart/ and user feature (leftmost column) Video calls for messengers with Android F-droid/apk yes.
With a Guardian repo's Tor Browser package installed you can use FFUpdater to update, which pulls the torproject's .apk (currently 13.0) and later will keep it updated.
% curl ipinfo.io/ip
curl: (7) Failed to connect to ipinfo.io port 80 after 25 ms: Connection refused
% curl https://ipinfo.io/ip
curl: (7) Failed to connect to ipinfo.io port 443 after 29 ms: Connection refused
They suck and apparently block curl (and lynx and elinks) from dynamic IP, it works in Firefox or on a server with static IP.
Right, no "soundproof" curtain will absorb low frequency noise (which street noise unfortunately to a large extend consists of), regardless what ads are trying to sell you. Heavy curtains can absorb high and mid range frequencies quite well and professional acoustic curtains made of heavy (≥500 g/m²) Molton or Calmuc are the best you could get (the cloth costs about 10-15 €/m²), but if honest producers will tell you they won't help against low frequency noise. Anyway, if your windows aren't too large you could try that for a few bucks..
The best bet are new insulated vacuum triple glass windows that aren't cheap at all.
So not anonymous, but pseudonymous.