Nowadays, people must protect people from cyber attacks. It start from you mobile phone. Don't believe me? Just watch news report by Channel News Asia:
Read Report here >
See already then you understand by you don't anyhow send sms to people. Especially to your OKT or mistress. Later kena track you also don't know. Then how?
Better play safe and use your own WiFi and use app like WhatsApp, Telegram, Signal, Line and so many many more. For me, I got WhatsApp, Telegram and WeChat.
Don't sms ya!