How do you install a SIM card in your mobile phone?

          Open up the battery slot should be under a flat battery.

          First, switch off your phone. Remove the back of your phone and you should see the battery. The SIM card will either be visible beside the battery, or it will be beneath the battery. Remove the battery to gain access to the SIM card. The SIM card can then be slid out of its holder. You can then replace the SIM with a new SIM. Make sure it is in the correct way and replace the battery and the cover. Switch phone back on.

Do cellular phone towers cause any other health problems?

          While high levels of RF waves can cause a warming of body tissues, the energy levels on the ground near a cell phone tower are far below the levels needed to cause this effect. Thus far, there is no evidence in published scientific reports that cell phone towers cause any other health problems.

How do cellular phone towers work?

          Cell phone base stations may be free standing towers or mounted on existing structures, such as trees, water tanks, or tall buildings. The antennas need to be located high enough so they can adequately cover the area. Base stations usually range in height from 50-200 feet.

          Cell phones communicate with nearby cell towers mainly through radiofrequency (RF) waves, a form of energy in the electromagnetic spectrum between FM radio waves and microwaves. Like FM radio waves, microwaves, visible light, and heat, they are forms of non-ionizing radiation. This means they cannot cause cancer by directly damaging DNA. RF waves are different from stronger types of radiation such as x-rays, gamma rays, and ultraviolet (UV) light, which can break the chemical bonds in DNA.

          At very high levels, RF waves can heat up body tissues. (This is the basis for how microwave ovens work.) But the levels of energy used by cell phones and towers are much lower.

          When a person makes a cell phone call, a signal is sent from the phone's antenna to the nearest base station antenna. The base station responds to this signal by assigning it an available radiofrequency channel. RF waves transfer the voice information to the base station. The voice signals are then sent to a switching center, which transfers the call to its destination. Voice signals are then relayed back and forth during the call.

Is it safe to live or work on the top floor of a building that has a mobile phone base station antenna on it?

          In general this will not be a problem.  The roof of the building will absorb large amounts of the RF energy. Typically a roof would be expected to decrease signal strength by a factor of 5 to 10 (or more for a reinforced concrete or metal roof). In addition, the FCC requires RF radiation evaluations of high-power rooftop transmitters.  Even a worst-case calculation predicts that power density on the floor below an antenna will meet all current RF safety guidelines, and actual measurements in top-floor apartments and corridors confirm the power density is far below all current RF safety guidelines.

I am in a situation where I would like to be able to wear my hands-free cellular kit all day. Does the radiation only exist when I'm actually making a call or just any time the phone is on?

          Whenever they are turned on, cell phones communicate at infrequent intervals with a nearby base station even when they are not being used for a call. This is necessary to tell the system where the user is in case a call should come in. Thus, even while they are inactive, the phones are a source of (very low) RF energy exposure to the user.

          Hands-free kits reduce exposure to a user by removing the phone from the vicinity of the head. There is no identifiable health benefit in using the kits, but there is no detriment either, and using them may increase a user's peace of mind. In your case, the cell phone and hands-free kit are clearly an important link to the outside world and I would not hesitate in using them. There may be comfort issues with having the earpiece in place for a long time, but RF radiation exposure should not be a concern at all. The hands-free kits will reduce exposure below that which you would receive if the phone were kept close to your head.