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1. Go to WP - Bulk SMS - by SMS.to plugin - Settings - Features - must be selected as below

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STEP C:

1. Go to WordPress Users - Your Profile - Add the mobile phone - Update the Profile
   

   

2. Enable WP User registration so you can get the mobile phone during the time of registration

3. Go to WordPress - Settings - General - Membership - select it.

4. Save Changes

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