In fact, Linux is not commonly used on mobile phone
, but it's always used by Motorola. And as the market share is not large, the Linux smartphones appear to be safer. There is no strict security identity limit for blackberry, namely the software installing of RIM. Just as the Symbian S40 mentioned above, it's the risk system which is with large market share. It's all talk about the security authentication of Windows Mobile. It's defined to be high risk.