Under normal circumstances, it is not illegal to use someone else's credit card after consulting with others. If the perpetrator fraudulently uses another person's credit card for credit card fraud, the amount is relatively large, which constitutes the crime of credit card fraud, and he shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention, and shall also be fined not less than 20,000 yuan but not more than 200,000 yuan.

Legal objectivity:

Article 266 of the Criminal Law of People's Republic of China (PRC) stipulates that whoever defrauds public or private property in a relatively large amount shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.