While these public link shorteners have been useful in the past, wireless carrier's no longer permit the use of shared public URL shorteners like Bitly, TinyURL, etc. These public link shorteners are frequently used by scammers to send malicious links. Because of this wireless carriers block texts that include Bitly links to protect their customers from receiving spam texts. If you want to send shortened links in your texts you need to use a branded link shortener.
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Create a branded link shortener in your Clearstream account. It's free, easy to set up, and it allows you to track link clicks, so you can know how many people clicked your link.

Create a branded link shortener from Settings > Short Links.