At that time, I got the card online. After I came back to activate it, I always received text messages saying that the owner of this number owed thousands of dollars everywhere, and even called me.

this is what people who have used this number before do. In the past, people didn't pay the phone bill, but after the mobile company stopped for three months, they introduced the number for sale. Whoever took it will have the same ending. Weiyi's way is to change the number again, which can solve your current dilemma. Changing the number is not necessarily the same problem. Anyway, as long as someone stops working for more than three months, they will re-issue the card for sale.