Searching online turns up plenty of sites that let you read SMS for free. Free is tempting, but they have a serious drawback for creating accounts.
The same number is shared by countless people, and every message is public. Anyone can use account recovery to take over an account created with it. These numbers are also heavily used, so most services block them and verification often fails.
From the moment you get the number, only you use it for the activation period. Messages appear only on your screen, and many numbers are fresh, so verification works far more often. Prices start at a few cents depending on the service and country.
For a quick test that an SMS arrives, a free site is fine. For an account you plan to keep, use a one-time number and set up two-step verification and a recovery email right after signing up.
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