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Mask Phone Number But retain original while click to Dial

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Posted on by Jazeb Malik

I’m working with multiple entities (e.g., customers, leads, contacts), each containing phone numbers of varying lengths. I need to display masked versions of the phone numbers for privacy (e.g., in UI or logs), while still being able to access and use the original number for operations like click-to-dial.

Example Use Case:

Displayed on screen: +1-*****3210
Original value used for dialing: +1-9876543210

Requirements:

Phone numbers can vary in length and format (some may include country codes).
Masked version should:
- Preserve last 3–4 digits.
- Optionally keep prefix (e.g., +1).
- Original (unmasked) number must remain accessible for backend logic like click-to-dial.
Must work across multiple entities consistently.
Should avoid storing two versions of the number if possible—masking should be on-the-fly or display-only.

Questions:

What is the best way to implement this masking logic (UI masking vs data masking)?
How can I ensure the original number is still used for dialing while showing only a masked version in the UI?
Are there recommended libraries, functions, or design patterns for this use case in [your tech stack]?

Any suggestions, best practices, or code examples would be greatly appreciated!

Categories:

Dynamics 365 general

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André Arnaud de Cal... 299,407 Super User 2025 Season 2 on at

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Mask Phone Number But retain original while click to Dial

Hi Jazeb,

Can you tell us what Dynamics 365 application this question is related to? There are several different solutions in the Dynamics 365 family, like: Sales, Finance, Supply Chain Management, Project Operations, and Business Central.

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Suggested answer

DAnny3211 11,382 on at

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Mask Phone Number But retain original while click to Dial

Hi,

To implement phone number masking while retaining the original number for operations like click-to-dial, here’s a recommended approach based on best practices in Dynamics 365 and general UI design:

Recommended Strategy

1. UI Masking (Display-Only)

Mask the number on-the-fly in the UI using a formatting function.

Example logic:

function maskPhoneNumber(phone) { const prefixMatch = phone.match(/^(\+[\d]{1,3})/); const prefix = prefixMatch ? prefixMatch[1] : ''; const lastDigits = phone.slice(-4); return `${prefix}-*****${lastDigits}`; }

This ensures the original number remains untouched in the database and backend logic.

2. Click-to-Dial Logic

Use the original number in the href attribute for dialing:

<a href="tel:+19876543210">+1-*****3210</a>

This way, the user sees the masked version, but the dialer uses the full number.

3. Centralized Masking Function

Implement a reusable function in your front-end layer (e.g., JavaScript, TypeScript, or XRM scripts) to apply consistent masking across entities.

4. Avoid Storing Masked Values

Keep only the original number in the database.

Masking should be applied dynamically during rendering or logging.

Best Practices

Security: Ensure masking is applied consistently in logs, exports, and UI to protect sensitive data.

Performance: Avoid complex regex or transformations in large datasets—use lightweight masking logic.

Scalability: If using Power Apps or model-driven apps, consider using calculated fields or PCF controls for dynamic masking.

Please verify if this approach aligns with your use case or if you'd like a code sample tailored to a specific tech stack.

Thanks and best regards,

Daniele

Note: This response was prepared with support from Copilot to ensure clarity and completeness.

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