There has always been a debate about whether or not mobile phone usage causes cancer.

Finally, international experts have the answer, which is we think so.

WHO's International Agency for Research on Cancer (IARC) panel now classifies mobile phones as a 2B, which means mobile phones are considered a carcinogenic hazard on par with pesticide DDT, engine exhaust, lead and chloroform.

The IARC consists of 31 experts from 14 countries. Until Tuesday's announcement, the WHO's position was that cell phones did not cause cancer.

However, experts concluded that it was not clearly established that it does cause cancer in humans.

Numerous previous studies done in Europe, New Zealand, and U.S have found no link between mobile phones and cancer.

The type of radiation released from mobile phones is non-ionizing. It is different from an X-ray and more like a very low-powered microwave oven.

Experts addressed the importance of additional research on the health impact of heavy usage of mobile phones.  Since many cancerous tumors take up to 10 years to develop in many cases, experts stated it's not possible to conclude that mobile phones have no long-term health risks.

According to a recent study conducted by the NIH, mobile phone usage can accelerate brain activity, but it is unclear whether or not that has any hazardous health effects.

However, many popular phone manufactures such as Apple and Blackberry already warn consumers to keep certain distance from the device.

The WHO said there are 5 billion mobile phone subscriptions globally, or almost 75 percent of the global population.