I received a short message from CCB to increase the credit card limit and asked to make a phone call.

This should be a scam message, don't believe it. CCB did invite customers to apply for adjusting the quota recently, but you don't need to submit any information at all, let alone call back. If you are willing to adjust, just reply according to the content of the short message, just use the 4 digits of your card tail number and do not need to provide other information.

Nowadays, many fraudulent short messages, like real short messages, are sent directly through 95533, and you can't believe them all. Because scammers now send short messages with pseudo base stations. Baidu says pseudo base stations like this. "Pseudo base station equipment generally consists of a host and a laptop. Through SMS senders, SMS senders and other related devices, you can search the information of mobile phone cards within a certain radius, and pretend to be a base station of an operator, and use other people's mobile phone numbers to forcibly send SMS messages such as fraud and advertisements to users' mobile phones. "So, this is not a system vulnerability of CCB, but a pseudo base station. Pseudo-base stations can forcibly send short messages to your mobile phone, and now telecom operators can't stop it.

Don't call back or click on any links if you don't know. If you have any questions, please call the customer service hotline after the card.