According to British scientists, cellular phones do not pose short-term health risks, but a report, the largest investigation in the U.K. into the possible health risks of mobile technology, did say that it was too soon to tell whether mobile phones have long-term health affects.

Scientists from the Mobile Telecommunications and Health Research (MTHR) Program said the 6-year program found no evidence that mobile phone use affected brain function or could cause brain cancer.

But Professor Lawrie Challis, chairman of the program, reportedly said studies so far had not included enough participants who had used cell phones for 10 years or longer. Challis also noted that most studies in the U.K. did not include children, who may be more sensitive to radio-frequency exposure. The MTHR said more studies are underway.

Although many studies to date have testified to the safety of mobile phones, concerns are rising as more and more people use wireless devices for the sole means of communications.