Cell Phone Towers atop Old St. Vincent's Hospital, Vernon Hill, Worcester
The use of cellphones and other personal wireless devices is voluntary and intermittent however exposure to high levels of RFR (Radio Frequency Radiation) from nearby cell phone base antennas is not. The FCC (Federal Communications Commission) uses criteria 30 years out of date to decide if RF exposure is safe. If it does not heat you up, it's safe, they say.
Is RFR from close by cell phone base sites harmful? Does it cause cancer? Two people were diagnosed with brain cancer after three towers were installed next to their upscale C-scheme neighborhood in Jaipur, India. Since then, illnesses, both minor and major, have become part of their lives and the lives of some 50 other families in their neighborhood. Cancer happens in extreme cases, with almost everyone living close to mobile towers reporting disorders such as sleep disturbances, headaches, fatigue, joint pains, among others. 
As cell towers have proliferated since the early 1990s, so has the number of concerns being raised by the public and anecdotal reports to physicians about health effects from the towers. But the WHO still considers base station studies to be of lower priority than studies of effects from cell phones themselves. Because of that priority only a handful of studies exist on effects from cell tower base stations. 
A study done in Brazil shows a link between 4924 cancer deaths and cell tower proximity.  In Belo Horizonte victims had cancer types that may be caused by electromagnetic radiation, such as tumors in the prostate, breast, lung, kidneys and liver. The researcher found that 80 percent of those victims lived within 500 meters away from one of 300 antennas in the city. 
In Nalia, Germany: (within 400 meters = 1312 feet = ~¼ mile) significantly higher rates, and earlier development (8 years earlier), of malignant tumors; after 5 years of tower operation, cancer risk increased to 3 times that of those living outside area. 
In Spain: (up to 300 meters = 984 feet) up to 45% of women (but only half as many men) have fatigue, sleep disturbances, headaches, feeling of discomfort, difficulty concentrating, depression, memory loss, visual disruptions, irritability, hearing disruptions, skin problems, cardiovascular disorders, dizziness (these are the symptoms of electrohypersensitivity, a condition recognized by the World Health Organization). Repeat study recording exposure to radio frequency: within 50-150 m (164 – 492 feet) of cell phone antenna at 0.11 +/- 0.19 microW/cm2 – headaches, sleep disturbances, irritability, difficulty concentrating, discomfort, depression, dizziness, appetite loss, and nausea. ,
In Rennes, France: people living within 300 meters of cell antennas reported the following disorders: extreme sleep disruption, chronic fatigue, nausea, skin problems, irritability, brain disturbances including difficulty concentrating, depression, memory loss and headaches; visual disruptions, irritability, hearing disruptions, skin problems, cardiovascular problems and dizziness.  In Egypt: high risk for developing nerve and psychiatric problems, and changes in neurobehavioral function; significantly lower performance on tests for attention, short-term auditory memory, and problem-solving.  In Israel: those living near a cell tower for 3-7 years had a cancer rate 4 x higher than control population, with breast cancer most prevalent. 
Malaga, Spain: 43 cancer cases out of 350 residents near a cell tower, 35 died. 
The International Association of Firefighters (IAFF) realized that US & Canadian limits based on thermal heating were inadequate; that a report to Health Canada in 1999 found "RF fields at intensities far less than levels required to produce measurable heating can cause effects in cells and tissues [including] alterations in the activity of the enzyme ornithine decarboxylase, in calcium regulation, and in the permeability of the blood-brain barrier." A 2004 "study, not affiliated with the wireless industry, was conducted of firefighters exposed to RF radiation from cell towers/antennas affixed to their stations. The study "revealed brain damage that can be differentiated from chemical causation (such as inhalation of toxic smoke) suggesting RF radiation as the cause of the brain damage found on SPECT scans". The IAFF had an initial study done of the neurological symptoms of six firefighters who were working and sleeping in fire stations with cell towers in 2004 and resolved that "The only reasonable and responsible course is to conduct a study of the highest scientific merit and integrity on the RF/MW radiation health effects to our membership and, in the interim, oppose the use of fire stations as base stations for towers and/or antennas for the conduction of cell phone transmissions until it is proven that such sightings are not hazardous to the health of our members." ~International Association of Fire Fighters (IAFF) 
565 Study of the health of people living in the vicinity of mobile phone base stations: I. influences of distance and sex, R. Santini et al, Institut National des Sciences Appliquées—laboratoire de biochimie-pharmacologie, 2002 http://www.bibliotecapleyades.net/scalar_tech/esp_scalartech23.htm 566 Neurobehavioral Effects Among Inhabitants Around Mobile Phone Base Stations, Abdel-Rassoul et al, Neurotoxicology, 8-01-2006 http://www.iddd.de/umtsno/emfkrebs/EgyptStudy.pdf 567 Increase of Cancer Near Cell-Phone Transmitter Station, Wolf D. and Wolf, International Journal of Cancer Prevention 1-2, (pp. 123-128), April 2004
@ ALARA = As Low As Reasonably Achievable. This is a radiation safety principle for minimizing radiation doses and releases of radioactive materials by employing all reasonable methods. ALARA is not only a sound safety principle, but is a regulatory requirement for all radiation safety programs.
12 Radiation Safety and ALARA, North Carolina State University