Generally speaking, when applying for a credit card, you need to fill in the telephone area code of your company, according to the actual city where your work unit is located. Every province (autonomous region, municipality directly under the Central Government), special administrative region, prefecture-level city and major international city in China has its own area code, which can be obtained through online search according to the actual situation.

When applying for a credit card, you should fill it out according to the actual situation. You need to fill in your own unit telephone area code, and it is best to fill in the unit landline number to show the stability of the applicant's work and income source, which can improve the success rate of credit card application.