---
title: Locale Field Type
slug: segment/locale-field-type
createdAt: 2026-01-16T18:10:34.895Z
---

When creating Data Extensions for SMS sending in SFMC, Salesforce requires a locale data type to ensure that SMS messages have the correct country prefix when being sent. To this end, you must include a locale field, using either Fixed or Dynamic Custom Values depending on your case.

## Single locale

If your data belongs to one locale, you can use Fixed Custom Value to specify a default locale (e.g., 'en-US').

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## Multiple locales

If your data belongs to multiple locales, you can use Dynamic Custom Value to specify the locale for a specific area (e.g., if the country = 'United States', then value = 'en-US', if the country = 'Canada', then value = 'en-CA').

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