Legal analysis: In addition to guaranteeing the loan, you also need to sign in the column of guarantor to bear the repayment responsibility. If someone leaves you a phone number for a loan, you don't have to bear legal responsibility or repayment responsibility. If the loan company harassing, intimidating or threatening you by phone, you can ask the police for help.

Legal basis: Article 388 of the Civil Code of People's Republic of China (PRC) establishes a security interest, and a security contract shall be concluded in accordance with this law and other laws. Guarantee contracts include mortgage contracts, pledge contracts and other contracts with guarantee functions.

The guarantee contract is a subsidiary contract of the main creditor's rights and debts contract. If the principal creditor's rights and debts contract is invalid, the guarantee contract is invalid, unless otherwise stipulated by law.