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Hi, if you want to use the phone in Tanzania you should get unlock code or unlocked handset to use with any service provider, Please try to get unlock code, however if you want to drivers please go to blackberry.com and you can download latest version Blackberry Desktop Manager. and then you can install the software. I hope this information will help you.
Sometimes sellers lock the phone with a password. You can try contacting the seller for the password, they will usually give you the password without hesitation (basically it's their shipment delivery confirmation). Try a default one of: wireless1
Transferring media files back and forth between your phone and your computer is quite easy if you download the "Blackberry Desktop Manager" software from Blackberry.com. There is one button on the main screen that will say either "Media" or "Media Manager" when you have the software installed, and will allow you to copy music, songs, files from your computer to the phone or vice-versa. Hint: Always open the BB Desktop Software Manager on your computer first, before connection your phone with a USB cable. Will save you hours of time!
Something you can try. Open up Desktop Manager (with the BlackBerry unconnected) open up the Application
Loader. Before hitting next, pull the battery out of the 7750 for 5 to
10 seconds, then quickly put the battery back in, connect the
BlackBerry, and hit next on the application loader. This should
kickstart Application Loader to find the BlackBerry and allow you to
reload the handheld software. So, make sure you have the handheld software installed on your comptuer (which you already do)
You will need to be in the phone mode. To get there scroll the track wheel to the phone icon and press in on the scroll wheel.
When the phone screen is open you can dial a number then press in on the track wheel located on the side of the blackberry and scroll to send and press in on the track wheel to confirm.
You will repeat the steps above to open the email program to compose a email and then send the email.
I hope this helps
Email me if you need more help.