Why do i have a invalid sim?

[AC Question]

My phone recently ran out of minutes and i am sposed to be gettin minutes soon but my phone has a alert on it saying , invalid sim card. I wanted to know why i have this message and what it means . And do i need to replace the sim card before puttin time of the phone?

 

[belodion]

Have you spoken to your carrier about it? It may simply be that you have run out of credit.