The current production quality level of cellular phone technology results in extremely erratic emission characteristics (for any version of the same model). The range of maximum emission level variation can range up to 30X for any model leaving the assembly line.
assembly-line inconsistencies
Manufacturers do not even know with certainty whether any particular unit they produce actually meets a national standard that it was designed to meet. This surprising range of discrepancy is mainly due to the lack of consistency in assembly-line production, the complexity of the engineering design since manufacturers currently do not have the technological means to properly check their production runs. The problem is compounded by the fact cell phones have very delicate designs, by virtue of their size. For example, the slightest variation in a battery pack can dramatically affect the emission levels. Minimal cracks in a cellular phone (banging, dropping) may modify the circuitry and/or antenna sequencing and hence their emission characteristics.
units do not necessarily meet government standards
Cellular phones can be up to 6 times stronger microwave emitters than permitted by U.S. standards, either because of the manufacturers’ design/assembly-line procedure and/or user wear and tear. Under such conditions, not all cellular phone fitted with a Telly will necessarily show a decrease (at the user’s head) of power emissions to the recommended Polish standard of 0.01 mW/cm² – or the level at which no known biologically effects have been observed – even the non-thermal (that is, non-heating) effects.
The good news is that there do exist some cellular phones that already meet the Polish standard that is 100 times less than the U.S. standard, during good running conditions.
some things you should know about emission propagation such as from cellular phones
The glasses that you may wear, the shape of your face, the place where you make your call - such as inside a car where the microwaves bounce to and fro between the metallic body - can greatly affect how much microwaves you actually absorb inside your head. The presence of metal objects in the environment, or even inside your body (dental fillings, surgical implants, etc.) can locally increase exposure 100X - as noted in a 1977 research by Dr. Om P. Ghandi in Radio Science. Contrary to the case of powerfrequency electromagnetic fields, microwave absorption by the living body tends to increase with time - somewhat like X-rays and radioactivity. Microwave emissions also adversely interact with certain common medications.