Thank you so much for the information. (by the way, my phone is prepaid)
I'm trying my best to explain this clearly. My phone Cherry has anti-theft found in the settings. Unfortunately, out of curiosity, I clicked on it and typed the details asked. After that, I remembered my hubby said that he received a message in Chinese character, the same message (Chinese character) he received after I was locked out from my phone.
Inside the SETTINGS are wifi, bluetooth, flight mode, mobile hotspot, data usage, mobile networks, sim card manager, Smart Manager, applications, and the like. I usually open it if I want to disable an app or whenever i feel like changing my lock screen password. As what I have shared before, I open my phone and put another sim in the second sim holder, then I close it and turned on my phone. I confidently type my lock screen password but it kept saying wrong password. Someone told me to type the number sequence, the 000000 something, all to no avail. It keep asking for the privacy protection password.