This data is often synced in real-time to a central portal or CRM

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Specialized Software: Many event organizers and technology providers offer dedicated lead retrieval apps. Exhibitors use these apps on their smartphones or rented scanners.

Badge Scanning: Attendees' badges often have QR codes or barcodes containing their registration data, including (if consented to) their telephone number. The exhibitor scans the badge, and the app captures the information.

Real-time Sync:
Custom Qualifiers: These apps often allow exhibitors to whatsapp number list add notes and custom qualifiers to the captured lead data, enriching the profile beyond just the basic contact information.
"Tap-to-Call" or "SMS-to-Opt-In" QR Codes:

Direct Action QR Codes: QR codes can be programmed to initiate specific actions on a smartphone.
tel: URI Scheme: A QR code can embed a tel: URI. When scanned, it prompts the user's phone to dial a pre-set telephone number. This is more for initiating a call to the business rather than capturing the lead's number directly, but it can be part of a larger lead generation strategy where the inbound call is then captured.