You don’t need to sign the delivery certificate sent by mobile phone text message.

No need. The delivery receipt for electronic delivery via mobile phone text message is automatically generated, and there is no need to sign the delivery receipt, so there is no need to sign. A receipt of service refers to a certificate produced by the people's court or other judicial authorities in accordance with the legal format to prove the delivery of legal documents. It is a proof of service and a proof of the recipient's acceptance of service.