My phone keeps saying there’s no service but it does and I’m mad about it because I did this like four times already you better fix it because I’m ready I’m mad

Ranting to other users in this user to user forum will accomplish NOTHING.

The VERY FIRST think to do is to contact your carrier and ask if they have a local outage. It’s more common than you might think. And/or check here—>Down Detector - outages

Next, see this Apple support article—>If you see No Service or Searching on your iPhone or iPad - Apple Support

And specifically if you have an iPhone 7 see—>iPhone 7 Repair Program for "No Service" Issues - Apple Support

This is a user to user forum. There is nothing we can do for you. See if this offers any help: https://support.apple.com/en-us/HT201415. And, contact your carrier too.