How long will messages sent by mobile phones stay on other people's mobile phones? How long can it be deleted after it is sent?

It depends on whether the other party's mobile phone stores a SIM card or a mobile phone, and the storage time is related to the number of messages received. This is not a fixed value. Generally, the default setting of mobile phone factory is that the mobile phone stores short messages and the longest storage time. When the maximum storage capacity of the mobile phone (or SIM card) is exceeded, the earliest saved SMS will be automatically deleted (FIFO), but the old models such as Nokia will not be automatically deleted, and new SMS can only be received after manual deletion.

The short message capacity of mobile phone is related to the brand model, which can generally reach 500~5000. SIM card is generally 100~250.