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When to use it
When a lead form requires a phone number and completion is low, or sales reports junk numbers like 555-5555.
How to run it
Mark phone '(optional)' or remove it, and let sales collect it on the first call. If quality matters, test optional with a reason: 'Phone (optional, for a faster quote)'.
Why it works
Make the action easier to complete
Requiring a phone number costs leads but raises the share of leads you can call. MarketingExperiments measured 42% more conversions with phone optional vs required, so test against lead quality, not just volume.
Source: MarketingExperiments / Vital Design
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