Section 4 of 5
The Charts
Billboard's Hot Ringtones, RIAA master-tone certifications, Crazy Frog at number one, and the four-billion-dollar peak.

- Hot Ringtones: Billboard Gave the Tone Its Own ChartThe launch of Billboard's Hot Ringtones chart in 2004 and the companion Hot RingMasters listing, documenting which tracks led it in its first years and what the chart's existence said about the industry's scale at its peak.
- Crazy Frog Goes to Number One and Nobody Is Happy About ItCrazy Frog's Axel F reaching number one in the UK charts in 2005 — Jamster's marketing campaign, Daniel Malmedahl's original 1997 'Insanity Test' recording, the ICSTIS complaints and the cultural reaction to a ringtone outperforming conventional releases.
- Gold for a Ringtone: What the RIAA Certified in 2006The RIAA's 2006 introduction of master-tone certification thresholds, which titles earned gold or platinum status, and what the figures said about the volume of the paid-download market at its peak.
- Chaku-Uta: Japan Invented the Paid Download in 1999How NTT DoCoMo's i-mode platform and the chaku-melo and chaku-uta formats created the world's first mass market for paid ringtone downloads between 1999 and 2002, establishing the commercial model every Western operator copied.
- Jamster, Jamba and the Subscription Nobody Meant to StartJamba's rebranding as Jamster, its premium SMS subscription model, VeriSign's 2004 purchase, and the consumer complaints that followed — documenting the UK's ICSTIS rulings and the American FTC actions as the industry's worst-practices moment.
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