Yealink T48S Skype For Business Edition User Manual page 38

User Guide for the T48S Skype for Business phone
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If you select Send me a code by text message, your mobile phone will receive a
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verification code:
Enter the correct code in the corresponding field and click Verify.
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Click Sign in another way to switch authentication method.
Click Text+XX XXXXXXXXX90.
Enter the correct code in the corresponding field and click Verify.