Dude. Pearl 2 is not a phone. It stands for Blackberry Pearl 2nd Generation. There has been two generations for Pearl.
1st Gen.: 8100, 8110
2nd Gen: 8120, 8130
It is divided this way becuase there is hardware upgrade in 2nd Gen. One of which is a newer and more powerful USB controller. This provide faster file transfer through USB cable connection.
The 1st Gen was full speed with around 1MB/s MAX
the 2nd Gen is HIGH speed with around 15MB/s MAX, highest in the market today.