Why is my network giving me problems

One a great day after using my phone for a while I switched it off to charge and after charging I switched it on back, then I noticed that I can't place calls or even on data anymore, it just changed to emergency calls only for a very long time, after some time it will be normal again, but the moment I on data again it will change to emergency to calls only, I can't call and people can't call me. I even changed my Sim card but yet it's still the same thing, I even had to factory reset my phone but yet it's still the same thing

Now I'm stuck with an s10e that can't use Sim card