no option to verify number by call instead of sms

• I have searched open and closed issues for duplicates (the error is similar to this, but the cause is different)
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

In previous versions of android signal app (circa November 2022), there was an option to verify phone number via a phone call (and another option to verify via SMS). In recent version 6.16.2, there is only option to verify by SMS.

There is no option to "Alternatively, you can request a verification call if you can not receive SMS. After the timer finishes counting down, tap Call me." as specified in the docs.

Steps to reproduce

• install Signal app on android device
• enter phone number
• no option to request phone call instead of SMS verification

Actual result: "Unable to connect to service. Please check network connection and try again"
Expected result: an option not to send SMS but make a call

Device: Fairphone, Samsung, ...
Android version: 5., 12.
Signal version: 6.16.2

Link to debug log

Start by reproducing registration on the listed Android versions and review the linked debug log alongside the linked verification documentation. Trace the phone-number verification entry point to determine why the call alternative is absent or the service connection fails. Done means eligible users can request a verification call instead of SMS, with the documented flow working.