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Actually no... SAR testing is something too complex to be done outside high level labs and costs thousands of dollars. As an example, if a company manufacture a cellphone it has to be tested. If a headphone is provided with the phone, the lab will test twice, with and without the headphone connected. Same for cover and any other accessory. A headphone is something used outside the cellphone, can you imagine the impact of changing something inside it, in special if you're adding metallic components? In short, there's no easy (and cheap) way to find out the impacts of changes in a cellphone without those expensive tests. Sorry... ;)
If your definition of "fun" includes the risk of getting cancer, starting a fire or having your inside flesh being burnt, this mod could be fun. Mine definition is way different... But trying it is up to you. Have fun, get safe! :)
My 2 cents about this Instructable... I know cellphones very well, working for a big phone manufacturer for almost 10 years; telecom engineer for more than 20 years. First, cutting back a cover may cut one or more phone's antennas, as you may find them there printed inside the cover for WiFi, BT, NFC and even from an eventually existing wireless charging system... I've also read people warns about accidental short-circuits and they're right, very likely to happen, but my real warning is about SAR (specific absorption rate), which is the radiation from the cellphone that is absorbed by human body. Any change (and I mean ANY) you make in a cellphone could potentially change the radiation but including metal parts, magnetic or not, in the cellphone will certainly change it dramatically. You might be creating kind of a tunnel of radiation concentrating the way out in two points: the magnetos external ends. While inside your pocket it might concentrate radiation in these two points potentially exceeding the cancer-safe limits recommended by the ICNIRP (International Commission on Non-Ionizing Radiation Protection - an organ linked to the United Nations Organization). Besides, microwaves may burn your inner flesh layers, where there's no nerve endings to feel pain. While original cellphones are reported safe to these two effects, any mod on them may (and will) change radiation path. This is really serious so I firmly advise you not to promote this kind of changes in a cellphone, otherwise you're assuming a serious risk of getting cancer or maybe burn part of your body without feeling pain. Believe me, this is really dangerous... My 2 cents... :)
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