Studies on iPhone and BlackBerry phones show that BlackBerry handsets contain nickel and cobalt that has been a root cause for skin allergies for their users with sensitive skin.

Around 30% of total population in Britain suffers from nickel allergy. The scientists found nickel in the phone buttons, keypad, speakers, camera and metal panels. The scientists believe that both nickel and cobalt cause an allergic reaction that includes itchy patches and dryness in the cheekbones, jaw line and ear areas.
Nickel is a silvery-white metal generally used in alloys due to its capability to resist corrosion. It is normally found in objects such as door handles, scissors, jewelry and is present in some food such as nuts and kidney beans.
After this study, the allergists recommend that people with sensitive skin should not go for BlackBerry phones. If already possess a BlackBerry, then they should limit their prolonged conversations, text messaging and handling their phones if they find any allergy symptoms. Women are more prone to nickel-associated skin allergies which are often noticed when they wear jewelry coated with nickel.
People suffering redness, eczema, itching, blistering, skin lesions near the cheek bones, ears or jaw lines are possible the victim of cell phone allergy. It is advisable to cover up the phone with another plastic case completely to prevent such allergies.
None of these complications were observed with the iPhones, which keeps them a step ahead in the competition.
http://www.healthline.com/health-blogs/healthline-connects/
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Source-Medindia