There is often technical trouble with the mail account like inability to access the account itself and in such situation your best solution is the Yahoo Customer Service number 1-866-324-3402 to solve all such troubles. There are other troubleshooting options that you have but none of them are as efficient as the yahoo mail phone number. Even the amateur mail service users who are not very familiar with the various troubleshooting methods can solve their trouble with the help of the number. The expert would give you a pass key to enter and reset the account password. The number is available globally.