I need a simple, mobile-friendly “Call Now” button added to all the pages of my existing Prestashop store. When a visitor taps it on any smartphone, it must launch the device’s native dialer with my store’s phone number pre-filled, ready to call. Here’s what matters to me: • Location: It needs to be visible on all the website pages, ideally in the header or another visually prominent spot so shoppers see it instantly. • Style: a standard, rectangular button that inherits my theme’s colors and fonts—no custom icons or text links. The visible label should read exactly “Call Now.” • Functionality: click-to-call must work across iOS and Android, without breaking desktop layout. On non-mobile browsers the button can either be hidden or display a tel: link that opens the default calling app (e.g., Skype) if available. • Implementation: clean Prestashop-compatible code—Smarty, CSS, and, if required, minimal JS. No core edits; use a module override, custom hook, or template injection so future updates stay hassle-free. • Delivery: updated files or a small zip module, short install steps, and confirmation that the feature works in common browsers and on at least one iPhone and one Android device. If you have done click-to-call or small Prestashop tweaks before, this should be quick. Let me know your approach and estimated turnaround.