: How do i make it difficult for users to make multiple accounts I'm creating a website for my business and I want to offer free first deliveries for the first week but I'm afraid people will

@Goswami781

SMS Verification is a good idea, users have to be pretty committed to get duplicate phone numbers, bonus of giving you a database of your customers phone numbers for marketing purposes or following up after a period of time.

There's various ways to do this depending on how you're constructing the website, which CMS, etc.

One example in wordpress you could use this plugin - here's a tutorial: premium.wpmudev.org/blog/verify-your-wordpress-users-with-a-text-message
Here's another plugin that might be useful: codecanyon.net/item/simple-sms-verification/6037963
There might be free versions about, but personally I don't mind pay a small fee for a product that will save me hours of stuffing around.

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@LarsenBagley505

I think the more you require in an account, the more difficult it is for one to reproduce it. By that, I mean you may want to require one's email address AND text messaging number and ask the user to confirm both pieces of information.

For the texting option, an easy way is to send a message less than 140 characters to a special MMS email address. Usually it consists of text that includes the new applicant's phone number followed by the @ then the cell provider domain.

Here's a URL that shows how to craft the email address:
holyworldwide.com/dustinhedrick/?page_id=1700

While the texting option is a good idea, people can change phone numbers.

Personally, I think the only way to truly answer your problem is wait several years until computing devices come with fingerprint scanners and users can swipe their fingers to identify themselves. I'm not sure how long that would take, but it would be a good security idea.

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@Welton855

Been dealing with this problem since 2001.

No good way.

Only option is to use Oauth 2.0 external authentications from Google/facebook/paypal and trust them to weed out duplicates.

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