Have you looked at your mobile data in settings and made sure you haven't accidently capped your data? There's an option for giving a warnng and turning off data after exceeding a certain amount.
Hi, I was going through the same situation. In my case I had to factory reset the phone for the data to work. I ported over from a different carrier. I triple checked the APN and honestly nothing was working. As soon as I factory reset the phone popp...