azurecurve

Allows a 16×16 flag to be displayed in a post of page using a [flag] shortcode.
Format of shortcode is [flag=gb] to display the flag of the United Kingdom of Great Britain and Northern Ireland; 247 flags are included.
Defintion of flags can be found at Wikipedia page ISO 3166-1 alpha-2: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

azurecurve Flags

Allows a 16x16 flag to be displayed in a post or page using a shortcode.

Webgrex

Narinder Singh

Country & Phone Field Contact Form 7 plugin is an add-on for Contact Form 7 plugin. This plugin add two new form tag fields that is Country list (form-tag: country drop-down) and Country Phone extensions list (form-tag: phone number) in Contact form 7.
Country & Phone Field Contact Form 7 helps you in creating a country drop-down list with country flags. The tag field will automatically add countries name in standard drop-down field of contact form 7.
How to add the fields in the contact form 7 
1.) Once you have installed activated the Country & Phone Field Contact Form 7 plugin. 
2.) Add the form-tag “country drop-down” and “phone number” to your form and save the changes.
Requirments: 
* Contact form 7 must be active plugin.
<h4>Recommended Plugins</h4>
The following plugin is recommended for Country & Phone Field Contact Form 7 users: 
* <a href="https://wordpress.org/plugins/contact-form-7/" rel="ugc">Contact form 7</a> by takayukister – With Conact form 7, you can use this plugin. Without contact form 7 this plugin have no needs.

Country & Phone Field Contact Form 7

Add country drop down with flags and phone number with country phone extension fields in contact form 7.

azurecurve Flags vs Country & Phone Field Contact Form 7