The more you block a cell phone from airwaves , the more power it uses to stay connected with the network.So you loose battery power. Now regarding radiation exposure , suppose before the use of any protection your phone use 0.8 watts to transmit , now woth protection you force it to go up to 2 . What have you gain ?
RE: SafeSleeve cases - ANTI-RADIATION CELL PHONE, TABLET, AND LAPTOP CASES