A DNS server is a Domain Name System server which is used to view the correct website when you enter a domain name (i.e., If you enter  zynga.com in the search bar the DNS server will connect you to the website by finding the IP of that domain to locate the web server where the zynga site is hosted). You can't work on this issue to clear the error it's in the hands of site owners and web hosters. But if you are intrested in finding out the DNS server and related records of any site, then you can find it at WhoisXY.com by doing a DNS query.

You can unblock your Samsung c3050 using the unblock code available at Unlock-Zone.com . To get the unblock code select the country and network to which your phone is locked to. Get the unlocking service and provide the IMEI no.,  when it is asked. You will get the unblock code via mail. Follow the instructions provided accordingly.

You can check out Tucktail,which provides a Search Engine Visibility service which allows you to submit your site (domain name) to Google search engine. Not only for Google also to Yahoo!, Bing, and AOL search engines. Also you get easy submission to over 100 search engines and directories.

Yeah you can buy the domain name which are already listed in Google search engine, if the owner of the domain name is ready to sell.

You can generate unlock codes using code generator software or online tools. But they generate random codes which may take many attempts to unlock, but make sure that how many input attempts are allowed. You can get details for how to unlock your HTC One S at MobileUnlockGuide.com .

Unlocking your HTC One S using the unique code based on your IMEI no., is the better option. You can get that at SimpleUnlocking.com .

You can unlock your Motorola using network unlock codes available at Unlocking4u.com . Select your phone model and proceed further to get the unlock code through mail.

A domain name is not essential to build a site. It is the must when you need to host it on the internet.