When micro-interaction makes great UX

When dealing with SMS validation code form, don't forget to add the autocomplete attribute with the value "one-time-code".

It allows iOS to autofill the input with the incoming SMS.

For iOS 12+ oneTimeCode can be used to indicate that a field can be auto-filled by a code arriving in an SMS.

import { TextInput } from 'react-native';

<TextInput
  textContentType="oneTimeCode"
  ...
/>

One more thing.
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David Leuliette is a freelance developer and trainer specializing in cross-platform application development. He helped dozens of companies to ship their MVP and automate their process.