Why forms and calls need explicit event tracking
Form submissions and phone call clicks are the two highest-intent actions on most Mumbai business websites, yet GA4 does not track either automatically both require explicit configuration through Google Tag Manager triggers to appear as measurable conversion events. Without this setup, a business can be generating real enquiries through its website while analytics shows zero evidence of it.
Setting up form submission tracking
Method 1: Thank-you page trigger (simplest)
If your form redirects to a dedicated "thank you" page after successful submission, this is the easiest method:
In Google Tag Manager, create a new Trigger ? Page View ? "Some Page Views" ? fires when Page URL contains "/thank-you" (or your specific thank-you page path).
Create a new Tag ? GA4 Event ? Event Name: "form_submission" ? fire on the trigger above.
Limitation: This method counts a page load, not strictly a form submission if someone navigates directly to the thank-you URL without submitting (rare, but possible), it would be counted. For most small businesses, this limitation is acceptable.
Method 2: Form submission listener (more precise)
For forms that do not redirect (showing a success message on the same page instead), GTM's built-in Form Submission trigger can listen for the actual submission event:
In GTM, create a Trigger ? Form Submission ? configure to fire on all forms or a specific form ID, with the option to wait for tags before form submission completes (important if you want to ensure the tracking fires before any page redirect happens).
This method requires more careful configuration and testing (using GTM Preview mode) but more accurately captures the actual submission action rather than a proxy page load.
Setting up phone call click tracking
Phone numbers displayed on mobile are typically formatted as clickable links: <a href="tel:+912212345678">Call Us</a>. Tapping this initiates a call on mobile devices.
In Google Tag Manager: create a Trigger ? Click ? Just Links ? configure to fire when Click URL contains "tel:".
Create a Tag ? GA4 Event ? Event Name: "phone_click" ? fire on the trigger above.
This tracks the click/tap on the phone number it cannot track whether the call was actually answered or its duration (that requires a separate call tracking service like Exotel or Knowlarity, which provides its own analytics).
Setting up WhatsApp click tracking
Similarly, for a WhatsApp button or link (typically formatted with an href containing "wa.me" or "api.whatsapp.com"):
Trigger ? Click ? Just Links ? Click URL contains "wa.me" (or your specific WhatsApp link pattern).
Tag ? GA4 Event ? Event Name: "whatsapp_click" ? fire on the trigger above.
Verifying these triggers actually work
Before publishing any GTM container changes live, use GTM's Preview mode: enter your website's URL, interact with the form/phone link/WhatsApp button on the live preview, and confirm in the GTM debug panel that the expected trigger fired and the corresponding tag sent the event. Skipping this verification step is the most common reason event tracking appears configured but never actually fires correctly.
After publishing, check GA4's Realtime report by performing the same test actions and confirming the events appear within seconds final confirmation before marking these as Key Events in GA4's conversion settings.
Frequently asked questions
Google Tag Manager is designed to allow non-developers to configure tracking without writing code, using its visual trigger and tag interface. A technically comfortable business owner or marketing person can typically learn to set up form and click tracking within a few hours using GTM's documentation and the steps above.
Embedded third-party forms sometimes complicate direct GTM event listening, since the form interaction happens within an iframe. In these cases, using the thank-you page redirect method (Method 1 above) or the tool's own native integration with GA4 (many popular form tools offer one) is often more reliable than trying to listen for the submission event directly.
Supplement, not replace. GTM phone click tracking tells you someone tapped to call (an intent signal, useful for marketing attribution within GA4). A dedicated call tracking service tells you whether the call was actually answered, its duration, and can even record it richer operational data, but a separate system from your core web analytics.