https://www.cnet.com/news/bring-your-iphone-xr-iphone-xs-or-iphone-xs-max-to-us-mobile-and-get-a-400-service-credit/

The new iPhone XS, XS Max and XR have arrived, and carrier US Mobile is dangling one seriously tasty "switch carrot." As in, "Switch to US Mobile and we'll give you $400."

It works like this: Activate a new line of service (with a new or ported-in number) for your iPhone XR, iPhone XS or iPhone XS Max and US Mobile will give you a $400 credit to use over 12 months. That's a Cheapskate exclusive, folks!