> ## Documentation Index
> Fetch the complete documentation index at: https://docs.invoca.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Mobile Dialer Displaying Hardcoded Number

> If a mobile click-to-call button has no tel: link, tapping it opens the dialer with the original hardcoded number instead of the swapped Invoca number.

## Symptoms

* The Invoca Tag is running on the website, and the number swaps as intended on both mobile and desktop.
* The issue is isolated to mobile devices: the number rotates correctly on the page, but when a visitor taps the click-to-call button, the dialer displays the original hardcoded number instead.

## Cause

Most sites include a `tel:` link behind a click-to-call button on mobile, which the Invoca Tag detects and updates as it runs. In this case, the button had no `tel:` link for the Tag to reference, so tapping it opened the dialer with the original hardcoded number rather than the swapped one.

## Resolution

Update the website, or ask a web developer to update the button, to include a `tel:` link for the hardcoded number.

**Applies to:** Invoca Tag

## Where to go next

* [What Is the Valid Format of Numbers Invoca Can Detect?](/s/article/valid-number-format)