The most beautiful SMS messenger for Android
If you chatted using Signal but the other person doesn't have it, then your messages are just regular SMS messages. In that case, any SMS app can read them. I advise QKSMS, it is a great SMS app.
Decrypt Signal encrypted backups outside the app
If your messages are Signal-encrypted, you can use the software on https://github.com/xeals/signal-back to export your encrypted messages as SMS, which you can then get as a PDF more easily.
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Decode Signal Backups
You can also try https://github.com/pajowu/signal-backup-decode, the author is active (replied to issues 12 days ago). On the previous repository, the author appears to be inactive (I should have checked, my bad).
Messenger ignored/lost sms after changing SIM card
1 project | reddit.com/r/SimpleMobileTools | 6 Dec 2022
What's the best messaging app? I'm new to android.
1 project | reddit.com/r/androidapps | 26 Nov 2022
In light of Signal's (bad) decision, what are some good SMS apps?
1 project | reddit.com/r/androidapps | 27 Oct 2022
Where is everyone moving?
2 projects | reddit.com/r/signal | 19 Oct 2022
Saturday APPreciation thread (Oct 15 2022) - Your weekly app recommendation/request thread!
3 projects | reddit.com/r/Android | 15 Oct 2022