You write a great headline. You have great reviews. The user is scrolling down, reading your content, and getting excited.
They decide: "Okay, I'll call them."
But wait. The phone number is at the very top of the page. They have to scroll all the way back up. In that split second of friction, they might hesitate. Or worse, get distracted.
The "Always Available" Principle
On mobile, the conversion action (Call or Form) should never leave the screen.
Why "Bottom" is Better Than "Top"
Many sites make the top header sticky. This is okay, but not ideal.
Phones are getting bigger. Reaching the top of the screen with your thumb requires a hand shuffle. Reaching the bottom is effortless. This is called the "Thumb Zone."
How to Implement (The Right Way)
You don't need a plugin. You can do this with a few lines of CSS.
The key is to use position: fixed and ensure it has a high z-index so it floats above everything else.
position: fixed;
bottom: 0;
left: 0;
width: 100%;
z-index: 9999;
background: #10B981;
color: white;
padding: 15px;
text-align: center;
}
Conclusion
This is the lowest-hanging fruit in CRO (Conversion Rate Optimization).
Adding a sticky bottom bar typically takes a developer 15 minutes, but it can increase mobile conversion rates by 15-20% overnight.