If somebody miss-guides by saying that you can receive the technical assistance for your Yahoo account by personally visiting the Yahoo authorized service center then do not trust on their word. Yahoo does not provide the service such way. Yahoo technical support is providing help through phone number only. You will contact support team via phone number and after listening to your problem they will tell you whether they will provide the service on call or they will give the home visit. In some cases Yahoo tech support team also provide the service by taking the remote access of user’s machine.