@hoangnam123 I have a prepaid cell for travell only yearly. At start each call x cents --- data would show up adds etc -- another x cents using up yearly balance. Even got charged by them telling me that i am now in a different time zone duh. Phoned in had them block data. You can access internet on wifi if wanted. Yearly is now x calls x texts. They can have them block it. Polecat
You can call in and ask it be removed, or you can set up an Extended Absence Greeting which does not allow messages too be left. Your Extended Absence Greeting could direct folks to another number you monitor, or simply direct them to call again.