It's optional, however once you chose to opt into it and they send the SMS code to your phone, you can't go to the next step of the account creation (or whatever the process is called to play the game) until that step is completed. So I COULD have skipped it, but I chose to send the code to my phone in case I ever needed to recover my account, however my phone was off, so I didn't get the code. There is no option to "resend code" like a lot of sites have, and I can't skip this step any longer.
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