Remove sms support

[archie94]

Aims to solve #364

Changes

• Removed SEND_SMS permission -> removed remote SMS notification feature.
• On Settings the Switch for enabling SMS and Signal notifications now only enables remote notification through Signal.
• on enabling the Switch we collect data required for remote notification ( a remote phone number, a verified signal phone number)
• the String for the Switch name has been edited, we need to update translations for the same.

Some thoughts:

• During on-boarding we may need to add a note to complete the Signal integration since having a remote number will not enable notification. IMO the Signal integration process is not very intuitive and can be further streamlined.

[lukeswitz]

Thanks for all the work on this. Forced adoption of Signal isn’t all bad, but it can be improved.

Did a small, hands-on workshop w/this branch yesterday; group of ten users. Signal & encrypted messaging was discussed & demonstrated followed by Haven.

*Users w/no prior knowledge of Haven

• 4/10 reported using Signal semi regularly/regularly.
• 10/10 had a paint point in onboarding, edit: configuring signal.
• 2/10 had problems trying to link signal. (Resolving was not simple, required emptying fields and restarting activities.)
• 10/10 asked if two signal numbers are required
• 5/10 said they’d use the app as is and enjoyed the experience.
• 4/10 said they would use the app if Signal was not required.
• 1/10 would not use this app in the future.

This is a tiny sample size from a tech-forward city. It did however contrast basic:advanced users and how they fell about learning two apps at the same time.

• Users that understood encryption were highly receptive to using/registering Signal.

• Some crashes were found when remote number is used without proper verification. Overall, better feedback than expected.

C’mon, Google, do the right thing.

[archie94]

Some very insightful metrics there. Signal verification flow needs some UX improvements. Right now there is no way to tell whether verification is a success or failure. In the coming week will dig into the signal-CLI and see if something can be done.

[n8fr8]

Yes, a basic step through Signal onboarding setup, explaining how to verify, would be helpful. We also need to explain the concept of whether you need a second "virtual" phone number or not.

One idea I had was to see if Signal was installed on the phone or not. If not, then just go ahead using the device's built in phone number. Otherwise, we can show a screen that says "Looks like you are already using Signal on here. You'll need to get a second number, and here is how."

[n8fr8]

No progress from Google contacts. Going to merge this, and then figure out a way to keep SMS as an option through an external APK of some kind, or perhaps a flavored build for F-Droid / APK download.