Your job itself is very dangerous and highly mobile, so your ability to make a stable repayment is uncertain. But you mentioned in the problem description that you received a short message from the bank inviting you to apply for a card, so it is reasonable to apply for a credit card according to your situation.
The four major state-owned banks have strict requirements for handling credit cards, and it is difficult to pass the examination. I suggest you choose a commercial bank, which has a high approval rate.
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Under normal circumstances, it is difficult for site personnel to apply for credit cards. Because the credit card review is strict, it is not recommended that you apply for a credit card for the time being. If necessary, it is best to prepare the following information first:
1. Identity certificate: 18~65 years old applicant's ID card;
2. proof of income: if there is no salary card, it is recommended to provide documents such as bank account running water;
3. Proof of financial resources: deposits, funds, real estate license, driver's license, etc. ;
You can go to the bank outlet when you have prepared the above information, hoping to pass the examination.