How long is the return visit message valid?

There is no fixed period of validity for text messages returning calls. The service provider is China Mobile, China Unicom or telecom company, and the company has the right to terminate this service.

Visit short messages, such as: let lonely old people spend their old age in the sunset, and let out-of-school children thrive in the sunrise. In this "Porcelain" charity activity, every customer buys a brick on June 5438+ 10/9, and we will donate two yuan to the welfare home on your behalf, and we will fulfill our social responsibilities with practical actions.