We can use the following widget to implement the telephone input.
https://github.com/jackocnr/intl-tel-input
Features
- Automatically select the user’s current country using an IP lookup
- Automatically set the input placeholder to an example number for the selected country
- Navigate the country dropdown by typing a country’s name, or using up/down keys
- Handle phone number extensions
- The user types their national number and the plugin gives you the full standardized international number
- Full validation, including specific error types
- Retina flag icons
- Lots of initialisation options for customisation, as well as public methods for interaction
