diff --git a/src/components/Profile/PhoneNumberSection.jsx b/src/components/Profile/PhoneNumberSection.jsx
new file mode 100644
index 00000000..8465dc58
--- /dev/null
+++ b/src/components/Profile/PhoneNumberSection.jsx
@@ -0,0 +1,71 @@
+import React, { useMemo, useState } from 'react'
+
+import { useI18n } from 'cozy-ui/transpiled/react/providers/I18n'
+import { useQuery, useMutation } from 'cozy-client'
+
+import Input from 'components/Input'
+import { buildSettingsInstanceQuery } from 'lib/queries'
+import { validatePhoneNumber } from 'lib/phoneHelper'
+
+const PhoneNumberSection = () => {
+  const { t } = useI18n()
+
+  const { mutate, mutationStatus } = useMutation()
+  const [formError, setFormError] = useState()
+
+  const instanceQuery = buildSettingsInstanceQuery()
+  const { data: instance } = useQuery(
+    instanceQuery.definition,
+    instanceQuery.options
+  )
+
+  const handleBlur = (_, value) => {
+    if (value !== '') {
+      mutate({
+        _rev: instance.meta.rev,
+        ...instance,
+        attributes: {
+          ...instance.attributes,
+          phone_number: value
+        }
+      })
+    }
+  }
+
+  const errors = useMemo(() => {
+    if (mutationStatus === 'failed') {
+      return ['ProfileView.infos.server_error']
+    }
+    if (formError) {
+      return [formError]
+    }
+    return undefined
+  }, [mutationStatus, formError])
+
+  const handleChange = (_, value) => {
+    if (value === '') {
+      setFormError(undefined)
+    } else if (!validatePhoneNumber(value)) {
+      setFormError('ProfileView.phone_number.invalid')
+    } else {
+      setFormError(undefined)
+    }
+  }
+
+  return (
+    <Input
+      name="phone_number"
+      type="tel"
+      title={t('ProfileView.phone_number.title')}
+      label={t(`ProfileView.phone_number.label`)}
+      value={instance?.phone_number || ''}
+      onBlur={handleBlur}
+      onChange={handleChange}
+      submitting={mutationStatus === 'loading'}
+      saved={mutationStatus === 'loaded'}
+      errors={errors}
+    />
+  )
+}
+
+export { PhoneNumberSection }
diff --git a/src/components/Profile/ProfileView.jsx b/src/components/Profile/ProfileView.jsx
index 9e0a82a0..f11f662e 100644
--- a/src/components/Profile/ProfileView.jsx
+++ b/src/components/Profile/ProfileView.jsx
@@ -19,6 +19,7 @@ import TrackingSection from 'components/Profile/TrackingSection'
 import PasswordSection from 'components/Profile/PasswordSection'
 import EmailSection from 'components/Email/EmailSection'
 import { PublicNameSection } from 'components/Profile/PublicNameSection'
+import { PhoneNumberSection } from 'components/Profile/PhoneNumberSection'
 import { hasQueryBeenLoaded, useQuery } from 'cozy-client'
 import { buildSettingsInstanceQuery } from 'lib/queries'
 
@@ -50,6 +51,7 @@ const ProfileView = ({
           <Stack spacing="l">
             <EmailSection />
             <PublicNameSection />
+            <PhoneNumberSection />
             <PasswordSection />
             <TwoFA />
             <LanguageSection />
diff --git a/src/lib/phoneHelper.js b/src/lib/phoneHelper.js
new file mode 100644
index 00000000..f3bbc160
--- /dev/null
+++ b/src/lib/phoneHelper.js
@@ -0,0 +1,26 @@
+/**
+ * Regular expression for phone number validation
+ * Supports formats:
+ * - May start with a + sign (optional)
+ * - May have parentheses for country/area code (optional)
+ * - Number groups may be separated by hyphens, spaces, or dots
+ * - Supports complex formats like "+1 (123) 456-7890"
+ */
+const PHONE_REGEX =
+  /^[+]?[0-9]{0,3}[ ]?[(]?[0-9]{1,4}[)]?[-\s.]?[0-9]{1,3}[-\s.]?[0-9]{1,4}[-\s.]?[0-9]{1,4}$/
+
+/**
+ * Validates a phone number
+ * @param {string} phoneNumber - The phone number to validate
+ * @returns {boolean} - true if the phone number is valid, false otherwise
+ */
+export const validatePhoneNumber = phoneNumber => {
+  if (!phoneNumber || typeof phoneNumber !== 'string') {
+    return false
+  }
+  return PHONE_REGEX.test(phoneNumber)
+}
+
+export default {
+  validatePhoneNumber
+}
diff --git a/src/lib/phoneHelper.spec.js b/src/lib/phoneHelper.spec.js
new file mode 100644
index 00000000..86a7e72c
--- /dev/null
+++ b/src/lib/phoneHelper.spec.js
@@ -0,0 +1,78 @@
+import { validatePhoneNumber } from './phoneHelper'
+
+describe('phoneHelper', () => {
+  describe('validatePhoneNumber', () => {
+    it('should return false for null or undefined values', () => {
+      expect(validatePhoneNumber(null)).toBe(false)
+      expect(validatePhoneNumber(undefined)).toBe(false)
+    })
+
+    it('should return false for non-string values', () => {
+      expect(validatePhoneNumber(123456789)).toBe(false)
+      expect(validatePhoneNumber({})).toBe(false)
+      expect(validatePhoneNumber([])).toBe(false)
+    })
+
+    it('should return false for empty string', () => {
+      expect(validatePhoneNumber('')).toBe(false)
+    })
+
+    describe('Valid phone number formats', () => {
+      const validPhoneNumbers = [
+        // Basic formats
+        '0912345678',
+        '123-456-7890',
+        '123.456.7890',
+        '123 456 7890',
+        '(123) 456-7890',
+
+        // International formats
+        '+1-555-123-4567', // US
+        '+44 20 1234 5678', // UK
+        '+33123456789', // France
+        '+49 30 1234 5678', // Germany
+        '+81 3 1234 5678', // Japan
+        '+86 10 1234 5678', // China
+        '+61 2 1234 5678', // Australia
+
+        // Mixed formats
+        '+1 (123) 456-7890',
+        '(123)456-7890'
+      ]
+
+      validPhoneNumbers.forEach(phoneNumber => {
+        it(`should return true for valid phone number: ${phoneNumber}`, () => {
+          expect(validatePhoneNumber(phoneNumber)).toBe(true)
+        })
+      })
+    })
+
+    describe('Invalid phone number formats', () => {
+      const invalidPhoneNumbers = [
+        // Too short
+        '123',
+        '+1',
+
+        // Contains invalid characters
+        'abc1234567',
+        '123-abc-7890',
+        '123@456@7890',
+
+        // Incorrect format
+        '++1234567890', // Double plus sign
+        '(123))456-7890', // Unbalanced parentheses
+        '(123', // Incomplete parentheses
+
+        // Too long
+        '123456789012345678901',
+        '+123456789012345678901'
+      ]
+
+      invalidPhoneNumbers.forEach(phoneNumber => {
+        it(`should return false for invalid phone number: ${phoneNumber}`, () => {
+          expect(validatePhoneNumber(phoneNumber)).toBe(false)
+        })
+      })
+    })
+  })
+})
diff --git a/src/locales/de.json b/src/locales/de.json
index 522c8b22..53de39f9 100644
--- a/src/locales/de.json
+++ b/src/locales/de.json
@@ -146,6 +146,11 @@
       "title": "Benutzername",
       "label": "Dein Benutzername wird angezeigt, wenn du Dateien mit Cozy-Benutzern teilst."
     },
+    "phone_number": {
+      "title": "Telefonnummer",
+      "label": "Deine Telefonnummer wird verwendet, um dich zu benachrichtigen, wenn du dein Passwort vergisst.",
+      "invalid": "Die Telefonnummer fühlt sich nicht richtig an."
+    },
     "tracking": {
       "title": "Hilf uns, unser Produkt zu verbessern",
       "label": "Autorisiere Cozy Cloud, anonyme Nutzungsdaten zu sammeln, um unser Produkt zu verbessern."
diff --git a/src/locales/de_DE.json b/src/locales/de_DE.json
index e71f4efc..506f6430 100644
--- a/src/locales/de_DE.json
+++ b/src/locales/de_DE.json
@@ -146,6 +146,11 @@
       "title": "Benutzername",
       "label": "Dein Benutzername wird angezeigt, wenn du Dateien mit Cozy-Benutzern teilst."
     },
+    "phone_number": {
+      "title": "Telefonnummer",
+      "label": "Deine Telefonnummer wird verwendet, um dich über wichtige Ereignisse zu informieren.",
+      "invalid": "Die Telefonnummer scheint nicht korrekt zu sein. Bitte überprüfe sie und versuche es erneut."
+    },
     "tracking": {
       "title": "Hilf uns, unser Produkt zu verbessern",
       "label": "Erlaube es Cozy Cloud, anonyme Nutzungsdaten zur Verbesserung des Dienstes zu sammeln."
diff --git a/src/locales/en.json b/src/locales/en.json
index 20310475..6cf5904b 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -180,6 +180,11 @@
       "title": "Username",
       "label": "Your username will be displayed when you share files with Cozy users."
     },
+    "phone_number": {
+      "title": "Phone number",
+      "label": "Your phone number will be used to send you notifications and to enable you to recover your password.",
+      "invalid": "The phone number is invalid"
+    },
     "default_redirection": {
       "title": "Home screen",
       "label": "This is the first screen you will see when you open your Cozy.",
@@ -579,4 +584,4 @@
     "manage": "Manage my plan",
     "resume": "Continue"
   }
-}
+}
\ No newline at end of file
diff --git a/src/locales/es.json b/src/locales/es.json
index ddeceded..12c2d763 100644
--- a/src/locales/es.json
+++ b/src/locales/es.json
@@ -146,6 +146,11 @@
       "title": "Usuario",
       "label": "Su nombre de usuario será visualizado cuando usted comparta archivos con usuarios Cozy."
     },
+    "phone_number": {
+      "title": "Número de teléfono",
+      "label": "Su número de teléfono será utilizado para enviarle notificaciones por SMS.",
+      "invalid": "Su número de teléfono no parece correcto."
+    },
     "tracking": {
       "title": "Ayúdenos a mejorar nuestro producto",
       "label": "Autorizar Cozy Cloud a adquirir anónimamente sus datos de uso para mejorar nuestro producto."
diff --git a/src/locales/fr.json b/src/locales/fr.json
index 2a9ed74b..c76ca82d 100644
--- a/src/locales/fr.json
+++ b/src/locales/fr.json
@@ -180,6 +180,11 @@
       "title": "Nom d'usage",
       "label": "Votre nom d'usage est utilisé lorsque vous partagez des fichiers avec d'autres utilisateurs de Cozy."
     },
+    "phone_number": {
+      "title": "Numéro de téléphone",
+      "label": "Votre numéro de téléphone est utilisé pour vous envoyer des notifications par SMS.",
+      "invalid": "Le numéro de téléphone que vous avez entré ne semble pas correct."
+    },
     "default_redirection": {
       "title": "Écran d'accueil",
       "label": "C’est le premier écran que vous verrez en ouvrant votre Cozy.",
@@ -579,4 +584,4 @@
     "manage": "Gérer mon offre",
     "resume": "Continuer"
   }
-}
+}
\ No newline at end of file
diff --git a/src/locales/ja.json b/src/locales/ja.json
index 74caff00..76256c77 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -146,6 +146,11 @@
       "title": "ユーザー名",
       "label": "Cozy ユーザーとファイルを共有するときに、ユーザー名が表示されます。"
     },
+    "phone_number": {
+      "title": "電話番号",
+      "label": "Cozy は、アカウントのセキュリティを向上させるために、電話番号を使用することができます。",
+      "invalid": "電話番号が正しくないようです。"
+    },
     "tracking": {
       "title": "製品の改善にご協力ください",
       "label": "製品を改善するために、Cozy クラウドが使用状況のデータを匿名で取得する権限を与えます."
diff --git a/src/locales/nl_NL.json b/src/locales/nl_NL.json
index df9f7b6e..ef28b61f 100644
--- a/src/locales/nl_NL.json
+++ b/src/locales/nl_NL.json
@@ -177,6 +177,11 @@
       "title": "Gebruikersnaam",
       "label": "Je gebruikersnaam wordt getoond als je bestanden deelt met Cozy-gebruikers."
     },
+    "phone_number": {
+      "title": "Telefoonnummer",
+      "label": "Je telefoonnummer wordt gebruikt voor tweestapsverificatie en om je te informeren over belangrijke gebeurtenissen.",
+      "invalid": "Dit telefoonnummer is ongeldig."
+    },
     "default_redirection": {
       "title": "Voorpagina",
       "label": "Dit is de pagina die je ziet zodra je Cozy opent.",