How does kc send text messages? Is it the traffic used?

No texting. There are many VoIP phones in the market, which is dazzling. All VoIP phones have passed the test when they were launched, and they don't require high network speed (broadband is still necessary, of course). Connect to the Internet, open the software and enter the number through it. After the phone call, you have to charge it. Compared with ordinary telephone charges, it is very cost-effective and saves more than half. But the call quality will change with the change of network environment.