> ## Documentation Index > Fetch the complete documentation index at: https://revolai.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Phone Swap > Dynamic phone number replacement for call attribution — track which campaigns, ads, and traffic sources generate phone calls ## Overview Phone Swap is a **call attribution** feature that dynamically replaces phone numbers on your website based on the visitor's traffic source. When a visitor arrives from a specific campaign — Google Ads, Facebook, a partner referral, or any UTM-tagged link — the tracker automatically swaps your default phone number with a dedicated tracking number. When the visitor calls that number, you know exactly which campaign drove the call.

*** ## How It Works Open a campaign and set the **Original Phone** (the number on your website) and the **Replacement Phone** (a tracking number assigned to this campaign). See [Campaigns — Phone Swap](/widget/campaigns#phone-swap) for setup details. A visitor clicks your campaign link (with UTM parameters) and the tracker script loads. The tracker fetches the active phone swap rules from the server. The tracker checks the visitor's UTM parameters against each rule. All non-null match fields (utm\_source, utm\_medium, utm\_campaign, rvl\_ref) must match exactly. The first matching rule wins. The tracker finds all instances of the original phone number on the page — in `tel:` links, in text with the `data-revol-phone` attribute — and replaces them with the tracking number. The replacement preserves the original number's formatting. A `phone_swap` event is recorded with the original and replacement numbers. This event appears in the Activity Log and Campaign Performance table. The visitor calls the tracking number. You see the call attributed to the specific campaign — no guesswork needed. *** ## Phone Swap Tab The Phone Swap tab shows all active phone swap rules from your campaigns in a single table: | Column | Description | | -------------- | ------------------------------------------------------------------------ | | **Campaign** | Campaign name with UTM conditions (source, medium, etc.) displayed below | | **Phone Swap** | Original number → Replacement number | | **Status** | Active or inactive | This tab is a **read-only summary** — to add or edit phone swap rules, open the campaign in the [Campaigns](/widget/campaigns) tab and configure the Phone Swap section. *** ## Adding Phone Numbers to Your Website The tracker replaces phone numbers in two ways: ### 1. Tel Links (Automatic) Any `` link on your page is automatically detected. If the href matches the original number from a rule, it's swapped — both the `href` attribute and the visible text. ```html theme={null} +380 (44) 123-45-67 +380 (44) 987-65-43 ``` No extra attributes needed — the tracker finds `tel:` links automatically. ### 2. Data Attribute (Explicit) For phone numbers that are not in `tel:` links (plain text, spans, divs), add the `data-revol-phone` attribute: ```html theme={null} +380441234567

+380 44 123 45 67