The new additions include STA Travel and government ad agency COI. The news will go some way to quietening the rumours that Blyk’s low subscriber base is putting off some brands.

In January Blyk told ME it had 30,000 subscribers, and was gathering 3,000 more every week. It insists it is on target for 100,000 subs by the end of the year. It recruits new customers almost exclusively with demo teams signing youngsters up at strategic sites like university campuses.

Blyk was launched in the UK last September. It targets 16-24 year olds, offering 43 minutes of voice and 217 texts a month for free as long as they opt in to receive up to six ads to their phone a day. Forty five advertisers partnered with Blyk at launch, including Sony Ericsson, Coca Cola, SonyBMG, I-play, Ford, Adidas and Mastercard.