Help my service is not working

No

I have a hard SIM  in my phone 

Sounds like to me your SIM card could be damaged. The first thing you should do is a Network reset to see if that fix your issue. This usually gives your device a nice reboot and get you right back on track. If that does not work, I will be looking into having that SIM card replaced. Are you near one of our Xfinity stores?

Yes, but they normally don't help NOW customers 

You will need to reach out to NOW customer service and request a new SIM card for your device. 

I thought that's what I'm doing right now. 

Yes, you should be able to make your payment via app. That is actually our preferred method. 

Mobile phone service is not showing up on my account though 

Only the Internet is showing up

I cannot find my mobile NOW account 

Where do I find my mobile NOW account?

You might need to call in order to have your payment collected if you are having issues with the app. Have you tried using the web as well?

I have called and they're telling ne I have to pay with you guys  

Unfortunately, we are very limited when it comes to NOW accounts. Taking your payment is not something I can do for you at this time.