Contact Form with Phone Validation

I want a lightweight online contact form that focuses on gathering a visitor’s phone number. The single input must accept international formats and run advanced validation—checking country code, numeric characters only, and the correct total length before the form is allowed to submit... (Budget: ₹600 - ₹1500 INR, Jobs: CSS, Frontend Development, JavaScript, jQuery, jQuery / Prototype, PHP, User Interface / IA, Web Development)