T-Mobile's venture arm has invested an undisclosed amount into the U.K.-based femtocell maker, Ubiquisys. Google, Accel Partners, Atlas Venture and Advent Venture Partners had previously invested in Ubiquisys. Cisco and Intel recently invested in femtocell company ip.access and Qualcomm has put money into Airvana.

T-Mobile said it plans to test Ubiquisys' femtocell technology in trials in Germany, the Netherlands and the U.K. in the coming months. Meanwhile, its U.S. subsidiary is using WiFi hotspots in the home as an alternative to a femtocell solution to improve coverage in the home.

For more on T-Mobile's investment:
- read this article from the Guardian