The termination of the contract by SMS or WeChat is valid.

Legal analysis: Whether the termination of the contract by SMS or WeChat is valid depends on whether the sender meets the agreed or legal conditions for termination of the contract. If it is, it will notify the other party by SMS or WeChat that the termination of the contract is valid, otherwise it will be invalid.

The legal dissolution of the contract includes: (1) the purpose of the contract cannot be achieved due to force majeure; (two) before the expiration of the performance period, one party clearly indicated or indicated by his own behavior that he would not perform the main debt; (3) One party delays the performance of the principal debt and fails to perform it within a reasonable period after being urged; (4) One party delays the performance of debts or commits other breach of contract, which makes it impossible to achieve the purpose of the contract; (5) Other circumstances stipulated by law.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 562 The parties may terminate the contract through consultation.

The parties may agree on the reasons for one party to terminate the contract. When the reasons for the termination of the contract arise, the creditor may terminate the contract.

Article 563 The parties may terminate the contract under any of the following circumstances:

(a) the purpose of the contract cannot be achieved due to force majeure;

(two) before the expiration of the time limit for performance, one party clearly indicated or indicated by his own behavior that he would not perform the main debt;

(three) one party delays the performance of the main debt and fails to perform it within a reasonable period after being urged;

(4) One of the parties delays the performance of debts or commits other breach of contract, which makes it impossible to achieve the purpose of the contract;

(5) Other circumstances stipulated by law.

For an indefinite contract whose content is to continue to perform debts, the parties may terminate the contract at any time, but they shall notify the other party before a reasonable time limit.