High engagement on Facebook Ads but low reported conversions—could calls be the missing piece?

Hi everyone,

We’re running Facebook Ads and seeing strong engagement—good CTR, decent traffic, even some form fills.

But when it comes to actual conversions, the numbers don’t fully add up.

Here’s what we suspect:

A chunk of users might be calling us directly after seeing the ads—but since we’re not tracking calls, those conversions are completely invisible.

This creates a few problems:

• Campaigns that are actually working might look underperforming
• Budget decisions are based on incomplete data
• We might be undervaluing certain audiences or creatives

I’ve been looking into call tracking solutions (like CallAtlas) that help connect calls back to specific ads and also track missed calls.

If that’s true, it could completely change how we evaluate performance.

Quick questions:

👉 Has anyone uncovered “hidden conversions” through call tracking?

👉 Did it change how you allocate budget across campaigns?

👉 Any best practices for integrating call tracking with Facebook Ads?

Feels like we might be optimizing based on only half the data.