To send photos from a computer to mobile you need to have a Bluetooth compatible handset. You also need a blue tooth port in your computer; you can transfer data after turning on your cell phones blue tooth and configuring it with the blue tooth port connected to your computer. When you buy the Bluetooth port you will get a soft ware CD along with the port which will contain the drivers of the port.
You can also transfer your cell phone images via a data cable, which you get when you purchase the phone. The data cable is a faster way and is more compatible as it has been created by the manufacturer of the cell phone it self. Data cable are commonly available with most phones for example: Nokia, Samsung, Sony Erickson, Motorola etc.