Jamba/Jamster boomed—when VeriSign bought the business it had a turnover of $15 million per quarter and 3 quarters later this increased to $150 million a quarter—in 2005 the company made close to $600 million in revenue. VeriSign expanded Jamba/Jamster by the acquisitions of UNC-Embratel and Unimobile. Jamster also added to its revenues by adding "impulse purchasing"—when you downloaded one ringtone, you were offered others. This turned into interactive advertising, for which the mobile owner was charged, sometimes unknowingly. This created controversy in Europe, and was quickly withdrawn.