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diff --git a/lib/public/IPhoneNumberUtil.php b/lib/public/IPhoneNumberUtil.php
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+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP;
+
+/**
+ * @since 28.0.0
+ */
+interface IPhoneNumberUtil {
+	/**
+	 * Returns the country code for a specific region
+	 *
+	 * For example, this would be `41` for Switzerland and `49` for Germany.
+	 * Returns null when the region is invalid.
+	 *
+	 * @param string $regionCode Two-letter region code of ISO 3166-1
+	 * @return int|null Null when invalid/unsupported, the phone country code otherwise
+	 * @since 28.0.0
+	 */
+	public function getCountryCodeForRegion(string $regionCode): ?int;
+
+	/**
+	 * Converts a given input into an E164 formatted phone number
+	 *
+	 * E164 is the international format without any formatting characters or spaces.
+	 * E.g. +41446681800 where +41 is the region code.
+	 *
+	 * @param string $input Input phone number can contain formatting spaces, slashes and dashes
+	 * @param string|null $defaultRegion Two-letter region code of ISO 3166-1
+	 * @return string|null Null when the input is invalid for the given region or requires a region.
+	 * @since 28.0.0
+	 */
+	public function convertToStandardFormat(string $input, ?string $defaultRegion = null): ?string;
+}