Telecommunications corporation Deutsche Telekom invested $7.5m in Pinger, a US-based provider of free mobile communications services, on Thursday, through its corporate venturing division, T-Venture.

The round is the third, after a $3m series A round backed by Kleiner Perkins Caufield & Byers (KPCB) in 2005 and an $8m round which saw participation from KPCB and fellow venture capital firm DAG Ventures the year after.

Pinger is aiming to build the world’s first entirely free global communication network with carrier backing.…

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