I just wanna knw how come my cellular isn’t working

Follow these steps, testing after each step:

• No Service. 📶
• Cellular Update Failed. 📵

Need more help?

• Call Apple Support at 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Live chat using Messages. 💬

Can you provide some details, such as what is displayed on your screen?

There are many reasons that cellular may not be working, but with additional information it would just be wild guesses as to which of those possibilities might be the cause.