Make sure you can detect country code by phone number.

[rustonaut]

• There was a now out of sync PR https://github.com/rustonaut/rust-phonenumber/pull/5
• There was a local implementation which might or might not have merged.
• There might or might not be further problems

So:

• [ ] check what the current state is
• [ ] after refactoring this crate see how the feature can be implemented if missing