Hi tince1216,
Thanks for using the Apple Support Communities. If you are having issues with the mobile data behavior on your iPhone, you may find the information and troubleshooting steps outlined in the following article helpful (it is primarily aimed at a slightly different issue, but the troubleshooting should still be relevant):
If you see No Service or Searching on your iPhone or iPad - Apple Support
Regards.
My mobile data keeps turning itself off but I’m not connected to wifi. How can I fix this
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Mobile data turning off randomly