What are the VoIP phones that can send short messages?

I only know that Mobile Fetion sends short messages, and Unicom also charges. Skype is an international short message.

VoIP is mainly used to make international or domestic long-distance calls, and the tariff is cheap.

For example, skype can also send short messages, but it is expensive. It is better to send international messages directly through global communication.

Of course, for long-distance calls to mobile phones or landlines, this kind of VoIP is basically not free.