Blyk, a mobile phone operator that offers free calls to teenagers in exchange for sending them advertisements, is to expand into the Netherlands and has received funding from Goldman Sachs, the investment bank.

Goldman Sachs is the first heavyweight investor for the company, which has to date been backed by Sofinnova Partners, a French venture capital company, and a number of private individuals. The size of the investment was not disclosed. The Industrial and Financial Investments Company, a Kuwait-based fund, has also taken a stake.