Not quite true - some have shown an effect (Score 1)

Sorry, this is a resend with better formatting:

Not quite true, the following show a statistically significant evidence of an increase in risk of cancer:

Further aspects on cellular and cordless phones and brain tumours.
Lennart Hardell, Kjell Hansson Mild and M Carlberg
International Journal of Oncology, 22:399-407, 2003.

Pooled analysis of two case-control studies on the use of cellular and cordless telephones and the risk of benign brain tumours diagnosed during 1997-2003.
L. Hardell, M. Carlberg and K. Hansson Mild (Örebro; Umeå, Sweden)
International Journal of Oncology, 28:509-518, 2006.

Use of cellular telephones and brain tumour risk in urban and rural areas
L Hardell, M Carlberg and K Hansson Mild
Occupational and Environmental Medicine 2005;62:390-394

Kundi M, Mild K, Hardell L, Mattson M-O (2004): Mobile telephones and cancer - a review of epidemiological evidence.
Journal of Toxicology and Environmental Health Part B 7:351-384, 2004