Asumaru

“Multisite Language Switcher” is very attractive plugin. 
However, It may not be available for your site plan.
<ul>
<li>Site A (English) example-site.com/</li>
<li>Site A (Japanese) example-site.com/jp/</li>
<li>Site B (English) example-site.com/siteB/</li>
<li>Site B (Japanese) example-site.com/siteB-jp/</li>
<li>Site C (English) example-site.com/siteC/</li>
<li>Site C (Japanese) example-site.com/siteC-jp/</li>
</ul>
“Multisite Language Switcher” cannot tell the difference between site A, site B and site C. 
Therefore you cannot connect the language when there are site A, site B, site C.
“MSLS Grouping” adds “group_key” to settings of “Multisite Language Switcher”. 
For example, you set “group_key” with “SiteA” or “SiteB” or “SiteC”. 
You can limit a language site in a group by doing this plugin. 
You can display only the first site when there are multiple same language sites in a group.
And, it provide shortcode “SameLangSites” and widget “SameLangSites”. 
You can output the list of different groups of the same language. 
For example, “SameLangSites” of “site A (English)” lists ” site B (English)” and “site C (English)”.
<ul>
<li>Site A (English) => Site B (English), Site C (English)</li>
<li>Site B (Japanese) => Site A (Japanese), Site C (Japanese)</li>
</ul>
And, it provide “Language” column on the Table of Sites in network.
And, it provide “Language Flag” in Admin-Bar.

MSLS Grouping

You can multilingualize by "Multisite Language Switcher" with grouping the sites of the plural same languages.

Abanob Adel

International Telephone Box is a WordPress plugin that provides a robust solution for handling international telephone numbers in your WordPress website. It includes:
<ul>
<li>International telephone number validation</li>
<li>Country code selection</li>
<li>Phone number formatting</li>
<li>Mobile-friendly interface</li>
<li>Customizable appearance</li>
</ul>
<h3>Included Libraries</h3>
This plugin includes the following libraries:
<ul>
<li>
intl-tel-input (v17.0.19) – MIT License
<ul>
<li>Source: https://github.com/jackocnr/intl-tel-input</li>
<li>Copyright (c) 2013–2023 Jack O’Connor</li>
</ul>
</li>
<li>
jQuery – MIT License
<ul>
<li>Source: https://jquery.org/</li>
<li>Copyright (c) OpenJS</li>
</ul>
</li>
</ul>
<h3>External Services</h3>
This plugin connects to the following external service:
<ul>
<li>IPAPI – Used to automatically detect the user’s country based on IP address to preselect the country code field.
<ul>
<li>What is sent: The plugin sends a request to <code>https://ipapi.co/json</code> to retrieve the user’s country and location data (IP-based).</li>
<li>No personally identifiable data is stored or logged.</li>
<li>Terms: https://ipapi.co/terms/</li>
<li>Privacy: https://ipapi.co/privacy/</li>
</ul>
</li>
</ul>

International Telephone Box

A WordPress plugin for handling international telephone numbers with validation and formatting.

MSLS Grouping vs International Telephone Box