Slightly free VoIP short message software. Can the other party receive the message you sent without installing it?

Yes, both parties must install it. The services provided by Weiwei are based on network connection, supporting China Mobile Communication Company, China Internet, China Unicom and Wi-Fi networks, as well as data networks of mobile operators, such as 2G/3G. If the user's device cannot connect to the network, it will not be able to use pico. hope this helps