yes it is possible if your phone and computer are Bluetooth enabled. download Bluetooth drivers from your cell phone manufacturers web site and install them on your computer. for example, i have nokia phone and i have installed nokia pc suit on my computers which can sync contact and all information with outlook and send / receive files/ringtones through software from nokia.
what phone do you have? Every phone with bluetooth can do that I believe.. except certain Verizon ones. Verizon crippled some features like putting in ringtones and photos with their bluetooth phones. If you want more info, howardforums.com is a great forum. Check out their stickies, lotsa information.
I have a samsung E720... ive had a quick look around but havent managed to find anything specific for what i need. You can download special image editing, audio and calander software for the phone, but i cant find anything specific... unless i need to look at a generic software program designed by an independant company.
Well, you need to make the ringtones and pictures yourself. Pictures can be made through Photoshop and you can probably google what the size of a wallpaper should be for a samsung e720. Ringtones can be easily made by using mp3 splitting softwares. I don't know the specifications to ur particular phone (like if it accepts mp3 ringtones or what picture extention it takes) but that's the basics of it.
If I understand the OP correctly, he wants to use his wireless network to connect to a Bluetooth device?
If so, then the answer is no, this is not possible. They are different systems are run on different wavelengths. You need to get a seperate Bluetooth device for your computer. (Often referred to as a "dongle")
I bought a Belkin 10M Dongle quite a while ago. Cost me about £10 and works wonders. Simply plug into the USB, install the drivers and connect to your mobile as it is was plugged in directly. You can even use your mobile for file storage (If you have the available space, and need to do so)