Provide short message through the signing of the contract, revocation, modification.

提供短信通业务的签约、撤销、修改。

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Any modification alteration to the contract shall be made with the consent of both parties.

必须事先经双方同意，合同方可修改。

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Implements a modification or extension of the client across a contract.

实作合约上用户端的修改或延伸。

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Any modification alteration to the contract shall be made with the consent of both parties.

作出任何对合同的改变时，都要经过双方的同意。

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Any modification alteration to the contract shall be made with the consent of both parties.

作出任何对合同的改变时，都要经过双方的同意。

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