I spent last month trying to send insurance forms from my iPhone, and after three apps either crashed or never showed delivery proof, I finally tested a reliable option. The one that worked for me is a
mobile fax app called mfax - it gave me real-time receipts, 99.9% uptime, under four minute average send time, handles PDFs, photos, camera scans, and is HIPAA compliant. I sent twenty pages of medical records and every single fax confirmed within minutes. The pay-per-page model saved me compared to monthly subscriptions.