TNS Infratest conducted the survey on behalf of Deutsche Telekom in April 2011. The population was private households with online access in Germany. A representative sample of German onliners was surveyed in 2,000 computer-aided web-based interviews.
BITKOM (Nov. 25, 2010): Verbraucher horten 72 Millionen Alt-Handys (Consumers hoard 72 million old cell phones).
”Sustainability to Go – From street demo to smartphone”
Caution and carelessness in the Internet”
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