It is important to take security seriously when you collecting data from the users. Form data validation is required before submitting to the database. You can implement the client-side form validation easily with HTML5 without using jQuery. Use type and pattern attribute in HTML input field to validate a phone number.
Most of the business puts their contact number on their website. The clickable phone number is very useful when the user browsing the website from a mobile device. Click To Call link helps to dial the phone number directly from the website by one click.
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