FORTUNE — Gazelle, those guys in orange hoodies who pay cash for used smartphones, reported a sharp uptick in traffic Friday, the first day customers for the iPhone 5S could lock in the price of their old devices.
Specifically:
- Trade-ins were up four-fold Friday morning compared with the iPhone 5 launch last year
- Between 10 and 11am Eastern, Gazelle’s electronic trading desk recorded as many as five offers per second
- The average value per trade-in was $50 higher than last year, thanks to the large numbers of new-model smartphones that came in (iPhone 5, Samsung Galaxy S3 and S4).
- Samsung offers were up 70% from last month. Samsung was the most popular non Apple (AAPL) brand traded in by factor of three.