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Recently I have just discovered that a certain amount of the mobile phone frequency can be absorbed by human tissues.

For example, this is the SAR info of iPhone 4s:

Head: 1.180 W/kg 1 g
Body: 0.491 W/kg 1g
Hotspot: 0.491 W/kg 1 g

http://en.wikipedia.org/wiki/IPhone_4S

so hotspot means a hot spot on human body right?

Then question is:

What are hot spots on human body?

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    $\begingroup$ "Hot spot" does not refer to anything on the human body, but testing while using the phone's "Personal hot spot" feature: support.apple.com/kb/ht4517 See also the documents on "RF exposure info" at apps.fcc.gov/oetcf/eas/reports/… $\endgroup$ – jarlemag Jun 8 '14 at 22:13
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    $\begingroup$ I think hotspot in that context means the highest exposure amount as this document shows (apps.fcc.gov/eas/GetApplicationAttachment.html?id=1544448), which comes from the reference the above wiki page provided. $\endgroup$ – Bez Jun 8 '14 at 22:13
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    $\begingroup$ @ Bez, i don't think so, hotspot mean "if iPhone works as a WiFi hotspot" & the Wi-Fi hotspot can generate WiFi electromagnetic radiation). I opened a WiFi last time & I suddenly feel a litle bit of uncomfortable when sitting next to it so i have to turn it off. (radiationtalk.com/info/wifi_radiation.php) $\endgroup$ – Tim Jun 9 '14 at 2:14
  • $\begingroup$ The author has listed the Specific absorption rate of radio frequencies and asked about hot spots which is not something associated with the human body and is a mobile phone technology (to my knowledge). The question is just wrong and the author has not made relevant efforts to understand the topic before placing the question. $\endgroup$ – The Last Word Jun 11 '14 at 7:18
  • $\begingroup$ I vote to keep open. The question is reasonable and easily answerable:"Hot spots" in this context does not refer to anything on the body). $\endgroup$ – jarlemag Jun 12 '14 at 6:33
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Hot spots on the human body caused by cell phones are caused by the EMF/RF (ElectroMagnetic Frequency/Radio Frequency) emitted from the phones (or any mobile wireless device). (There is much conjecture about the safety of these frequencies and whatnot... That is not what I am here to talk about).

In this case, the term hot spot does not refer to you being a WiFi hot spot! It simply means that since the frequencies are similar to that of a microwave, you will absorb them and they will cause heating internally. These areas will remain warm for a time - whether you can feel it or not, some people can, some can't. Shown here is a thermal image of someone who recently used a cell phone and one who had not.

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Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

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    $\begingroup$ Sorry, but unless you show a reference that the different heat pattern on this image is caused by the radio waves, I call this bogus. It is much more likely that the heat simply built up behind the phone - the effect of read ears for long term talks was already present when our phones still had receivers. Additionally the modern smartphones develop quite some heat by themselves during operation. $\endgroup$ – Chris Apr 25 '16 at 19:23
  • $\begingroup$ @Chris Well, since Tim appears to be asking for information about the possibility of human tissues I deiced to answer it as such. I can't find a more reliable source with a similar image, that being said, how about if I just say something like, "This may be what a hot spot on a human would look like. $\endgroup$ – L.B. Apr 26 '16 at 23:31

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