Mobile data won't work on my iPhone

You are not connected to your carrier. You see where it says searching and there are no signal bars. You need to talk to your carrier, and take a look at this, If you see No Service or Searching on your iPhone or iPad - Apple Support

Do you see a message on the screen? If so, can you provide the exact text of that message? What version of iPhone do you have and what version of iOS?

I can’t my with sim from last one day my mobile network is same position searching searching