If you are unable to find a driver, software, etc... for your phone and we cannot help you out here, your best bet is to check your cell/smart phone manufacturer's support site. At these sites you can utilize knowledge bases, manuals, contact customer support, and find software updates for your device. If that does not pay dividends, another route to go would be to contact your carrier's customer service department. Usually the customer service reps can pass you off to technical support, who in turn can help you figure out how to solve an issue. If we missed any manufacturers, PM a mod and let us know.
In addition, it is virtually impossible to list all the cellular providers out there. Thankfully Wikipedia has compiled a list of the world's cell phone providers complete with links to the providers' websites:
You can find cellular providers for any region and country in these four Wikipedia entries. The Tom's Hardware moderation team, nor any user, will help you in regards to account specific information such as phone passwords, IMEI requests, root phone requests, e-mail syncing, and things of that nature. These things are against the terms of service for this board and all posts asking for this kind of assistance will be locked or deleted immediately. You must contact your provider for account specific assistance, and these links will help you get in touch with your cell phone provider.