Safety tips: Due to telephone fraud, SMS trap, luring to call back international calls, luring to call back toll stations, etc. Please answer and call back carefully when you encounter strange calls. If you use a free phone/mobile phone, you can answer at will and ask for details. If you need to call back, you'd better use a public phone without knowing the details of the other party. Don't believe in winning prizes, impersonating acquaintances, impersonating banks, etc. Don't remit money or transfer money to strangers before you fully identify yourself, and don't disclose your bank account number and password.