What is phone number?
A phone number in B2B enrichment refers to the direct dial or mobile of a prospect (preferred over the company switchboard). Modern enrichment providers run a "waterfall" of 5-15 phone-data sources to maximize hit-rate. A premium-tier waterfall returns mobile numbers for 40-60 % of US/EU B2B contacts; lower tiers settle around 20-30 %.
When you're working from a LinkedIn profile URL, the phone number field becomes one of the most-requested enrichments because it lets you complete the buyer profile without forcing the prospect to fill another form. The trade-off is hit-rate: the phone number value is only as findable as your LinkedIn profile URL is unambiguous.