There are two ways for users to activate the Visa Unlimited Card of China Merchants Bank: 1. They can directly log on to the website of China Merchants Bank Credit Card Center, select the function of "Inquiry on Application Progress" and enter relevant information according to the prompts to activate it. 2. Call the customer service hotline: 400-820-5555, select "4+#" in the voice to open the card, and follow the voice prompts to open the card. After activation, you can set the inquiry password and transaction password according to the prompt, and please sign on the back of the card, which is consistent with the application form.