Q: does anyone know what causes the no sim error in ipads

Hi there irvfromsaint louis,

Welcome to Apple Support Communities.

From what I gather, you’re seeing a ‘No Sim’ alert on your iPad. Even though the article linked below was created for iPhones, it provides a lot of great troubleshooting suggestions that can help you resolve the issue with your iPad.

If you see 'No SIM' alert on iPhone - Apple Support

Take care,

-Jason