no service

Hello everyone,

I've been getting "no service" on my iphone 7plus for the past week. And I have tried every single solution that is on the internet. I also realized that the only people who had this problem were the owners of Iphone 7 or 7 plus, and all happened after the latest update. I have 

1. restarted my phone over 100 times, 

2. called simcard service provider and they said my simcard is active,

3. commented on apple service providers already and they weren't helpful at all. They just mentioned the exact things that I had already done,

4. reset my network settings,

5. taken out my simcard a hundred times and put it in again,

6. turned the airplane mode on and off,

7.gone to the cellular settings, and it says it needs an update but where and how do I do it?

8. gone to the settings, general, about, and there is only one message under cellular issue, saying your iphone is unable to access cellular and make and receive calls.

9.updated to the latest version again

I thought the problem would be that my simcard could have possibly got scratched and funny thing is that when I took it out, I still have " no service" and I don't get a message saying simcard is not in the device. :)) 

I am sure this problem is because of the newest version that are probably not supporting iphone 7.

I am in desperate need of help, I'd appreciate your suggestions and tips in advance. 

tomorrow I am probably going to get my simcard changed as the last resort.