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It also provides agreement at the next level up, where Bluetooth cellular phones have to agree on when bits are sent, how many will be sent at a time and how the parties in a conversation can be sure that the message received is the same as the message sent. While it may sound complicated reverse cell phone search, a Bluetooth cellular phone works in a simple manner. A Bluetooth cellular phone communicates with different devices by sending data via a secure, low-cost short-range radio frequency. Using the technology, a Bluetooth cellular phone can connect to headsets, PCs can connect to printers or keyboards, and handhelds can connect to each other without any wires.