The betas are open to select carriers I know T Mobile participates in the betas and Verizon never joins betas.
When a beta opens up you will see a banner at the top of the members app if your card and phone is allowed to join it.
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Samsung usually wants unlocked units of the current flagship phones. At the top of the main page of the members app, a banner will appear announcing that the beta is open. Press it and follow instructions.
