Excuse me, what does it mean that my mobile phone sent a big message?

I looked it up online for you. Fafa is the leading third-party electronic contract platform in China. At present, it mainly provides electronic contract, electronic document signing and certificate depository services for industries and government agencies such as finance, insurance, third-party payment, tourism, real estate, medical care, logistics, supply chain, B2B, B2C online trading platform, human resource management, etc. At the same time, it provides comprehensive judicial expertise, online arbitration and lawyer services.

It still depends on the specific content of the message received by the landlord.