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When sending status update, receiving text messages, downloading App updates or calling your friends your mobile phone needs to connect to a radio tower via invisible electromagnetic radiation.
The amount of radiation emitted from a mobile phone varies considerably from model to another. In fact, some mobile phones emit more than 6 times the amount of radiation in SAR compared to other models. (SAR is the European Head Standard). However, a low SAR value is not necessarily a good thing. A low SAR value may automatically make the mobile phone "increase" the antenna reception if the signal is poor in one area - more so than in mobile phones with a high SAR value.
Source: http://www.mobilsiden.dk/nyheder/sa-meget-straling-afgiver-din-mobil,lid.33884/ (in Danish)
NOTE: If your mobile phone is not on the list, try googling "your mobile phone (brand/model) + SAR value"
RadiCover offers a variety of anti-radiation quality products e.g. mobile- and tablet covers that reduce up to 91% of the radiation.
All products have been tested and their effect documented in Danish labortories.
See the products here