What function should the mobile card open on the old computer?

Mobile phones need to have the following functions:

1, voice call function: the most basic communication function of the old machine, you can make calls and use voice calls.

2. SMS sending and receiving function: Old computers often do not support the complete SMS function of smart phones, but they can receive and view SMS content. Some elderly computers also support sending short messages (short message packages are required).

3, mobile data function: you can open the mobile data function, browse the web, chat, watch videos and so on. Some older computers may only support 2G network, which is slow, but it can meet the basic needs.

4. Home number function: multiple home numbers can be set to facilitate the elderly to make common calls.

5. Emergency call function: Older computers often have emergency call function, which can quickly make local emergency calls, such as 1 10, 120, etc.