(1) Buying a mobile phone by stages is a civil legal act. If it cannot be repaid, the seller can sue for payment or terminate the contract, and demand to pay the use fee according to the proportion of the amount still payable to the total amount, and the buyer will not be wanted for jail. (2) Article 634 of the Civil Code stipulates that if the buyer of installment payment pays the due price at one fifth of the total price, and fails to pay the due price within a reasonable period after being urged, the seller may require the buyer to pay the full price or terminate the contract. If the seller terminates the contract, it may require the buyer to pay the fee for the use of the subject matter. Accordingly, the buyer shall pay at the agreed time and amount. If the due amount is 1/5 of the total price of the mobile phone, the seller has the right to terminate the sales contract and demand to pay the mobile phone usage fee. Of course, the seller can also sue directly and demand payment of all unpaid amounts. (3) If you are unable to pay for the mobile phone, the dispute between the two parties is a civil dispute and should be resolved through civil legal procedures, not criminal legal procedures. Arresting wanted criminals is a criminal measure and cannot be used to solve civil disputes. (1) Failure to repay the installment loan on time is an economic dispute and will not directly lead to imprisonment or imprisonment. (2) After winning the case in the court, the creditor may apply to the court for enforcement. If the person subjected to execution fails to declare his property truthfully and refuses to execute the judgment of the court, judicial custody may be conducted. If the circumstances are serious, it constitutes a crime of refusing to execute the judgment or ruling. Article 313 of the Criminal Law The crime of refusing to execute a judgment or written order of a people's court, if the circumstances are serious, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or a fine; If the circumstances are especially serious, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years and shall also be fined. If a unit commits the crime mentioned in the preceding paragraph, it shall be fined, and the directly responsible person in charge and other directly responsible personnel shall be punished in accordance with the provisions of the preceding paragraph. If the installment payment for buying a mobile phone is overdue, it should be a civil dispute under normal circumstances. The debtor does not bear criminal responsibility, which is not an administrative violation. If the arrears dispute has not been decided by the court and has been enforced, the debtor will not be detained or arrested. However, if you do not pay after obtaining the mobile phone by means, it is suspected of committing a crime. After the public security organ files a criminal case, the public security organ may summon or arrest the criminal suspect (i.e. the debtor) at any time. Article 80 of the Criminal Procedure Law The public security organ may detain a flagrante delicto or a major suspect in any of the following circumstances: (1) Those who are preparing to commit a crime, are committing a crime or are found immediately after committing a crime; (2) The victim or a witness on the spot identifies him as a criminal; (3) criminal evidence is found around him or at his residence; (four) attempted suicide, escape or escape after committing a crime; (5) It is possible to destroy or forge evidence or collude with others; (six) do not tell the real name and address, and the identity is unknown; (7) Being seriously suspected of committing crimes on the run, committing crimes for many times, or committing crimes in association.