Do both parties need to open traffic for free SMS?

You don't need

E-mail free SMS, you just need the sender to install E-mail, and you can send it to any mobile phone user who doesn't have E-mail installed.

the receiver of the short message does not need to use the traffic, and receives it like an ordinary short message.

the e-mail used by the sender needs to be connected to the internet, and needs to be used in traffic or WIFI networks.

How to send it is as follows:

1. Open E-mail, and click on the free short message in my account

2. Select a mobile phone contact, enter the content of the short message, and then send it.