* Improve phone number parsing.
Previously, if you entered a phone number
including a country code during registration you'd
have a duplicate country code. Signal on Android
did not have this bug because it uses a different
API inlibphonenumber. This diff changes iPhone to
use the same API, which is smart enough to remove
the country code from the phone number the user
entered if needed.
Co-authored-by: Evan Hahn <evanhahn@signal.org>
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