Search for Similar Websites
In this day and age, there’s no such thing as a unique website. Every website has different competitors that provide similar services or products, even if they’re hard to find. Luckily, Google makes this task a little easier.
By using related: followed by the website’s URL, Google will show you a list of websites that are similar or related to the websites you typed.
You can try this right now. If you go to Google and type related:tmobile.com, you’ll get a bunch of carriers you can use.