At present, there are many forms of online contract signing and they are widely used. For example, if you apply for a loan from Ant Borrowing, an electronic contract will be automatically generated. As for how to confirm the parties to the contract, there are many ways. For example, personal real-name authentication plus video recording is usually used, and real-name authentication plus touch-screen handwritten signatures are also used (such as Ctrip's travel contract). There are currently no mandatory legal provisions on how to sign a contract and how to confirm the parties. According to the relevant provisions of the "Electronic Signature Law of the People's Republic of China", electronic signatures only require that the parties to the contract can be confirmed. Therefore, it is currently possible to sign a contract on a mobile phone, but you must pay attention to the confirmation method and preservation of evidence.