i285 Fix phone number validation on new user details

[junhyap]

Change Summary

Phone number validation has had the 0 removed from the check.

Replaced the placeholder with an example.

Change Form

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• [x] The pull request title has an issue number
• [x] The change works by "Smoke testing" or quick testing
• [ ] The change has tests
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Other Information

[Is there anything in particular in the review that I should be aware of?]

Related Issue

• Resolve #285

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