fix: the issue of number input in the corePhone

[priyanshu2k3]

fixes the issue of number input when number exceedes 15 digit it gets converted to the scientific

ref: #419

Description

fix:
the issue of number input in the corePhone issue NO #419

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• I have performed a thorough self-review of my code.
• I have added or updated relevant tests for my changes.
• My code follows the project's style guidelines and best practices.
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