Due to the many cell phones in use, there is increasingly a shortage of telephone numbers. To alleviate the problem, the

Question

Due to the many cell phones in use, there is increasingly a shortage of telephone numbers. To alleviate the problem, the government agency that oversees phone numbers and area codes needs to determine a new area code. How many area codes can be made? (Assume that an area code consists of three digits and it cannot start with zero as the only restriction.) 
1,000 
995 
800 
900

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