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Cell phone requirements
A cell phone(cell phone bluetooth) that is Bluetooth enabled is able to pair with many devices. To ensure the broadest support of feature functionality together with legacy device support, the OMTP forum has recently published a recommendations paper, entitled "Bluetooth Local Connectivity"( Bluetooth 2.0 cell phones); see external links below to download this paper.
This publication recommends two classes, Basic and Advanced, with requirements that cover imaging, printing, stereo audio and in-car usage.

Bluetooth 2.0(Bluetooth 2.0 cell phones)
This version of the Bluetooth specification was released on November 10, 2004. It is backward-compatible with the previous version 1.1. The main difference is the introduction of an Enhanced Data Rate (EDR) for faster data transfer. The nominal rate of EDR is about 3 megabits per second, although the practical data transfer rate is 2.1 megabits per second. The additional throughput is obtained by using a different radio technology for transmission of the data. Standard, or Basic Rate, transmission uses Gaussian Frequency Shift Keying (GFSK) modulation of the radio signal; EDR uses a combination of GFSK and Phase Shift Keying (PSK) modulation.
According to the 2.0 specification(Bluetooth 2.0 cell phones), EDR provides the following benefits:
• Three times faster transmission speed — up to 10 times (2.1 Mbit/s) in some cases.
• Reduced complexity of multiple simultaneous connections due to additional bandwidth.
• Lower power consumption through a reduced duty cycle.