Should You Give Your Phone Number at Checkout?

Short answer: Usually you don't have to. Shops ask for your number to link your purchases into a customer profile, send marketing texts and run loyalty schemes. You can say no and still pay, and in California, shops can't make it a condition of paying by credit card. If you want the loyalty discount without handing over your real number, give a second number you keep for sign-ups.

Why Shops Ask for Your Phone Number

"Can I get your phone number?" sounds like a small favour. For the shop, it's worth a lot. Your number is one of the few things that stays the same across every visit, every card you use and every member of your household who gives the same number. That makes it a perfect key for joining data together.

The usual reasons:

• Loyalty programmes and discounts. Your number is your account, so points and member prices follow it.
• Digital receipts and returns. Some shops look up receipts by phone number instead of email.
• Marketing texts. Giving your number at the till can count as signing up for promotional messages.
• Building a profile of you. Every purchase gets attached to your number: what you buy, how often, where and how much you spend. As one Consumer Reports investigator told WRAL, there's a price for loyalty perks, and it's usually your information.

What Happens to Your Number Afterwards

Once your number is in a retailer's system, it can travel further than the till:

• Shared or sold. Some retailers share or sell customer data to advertisers and data brokers, depending on their privacy policy.
• Matched with other data. Because the same number sits in many companies' databases, it's easy to match your shopping history with other information about you.
• Kept for years. Your number usually stays in the system long after you've stopped shopping there.

None of this is unusual, and much of it is legal. It's just worth knowing what the trade is before you make it.

Do You Have to Give It?

In most places, no. Paying doesn't depend on giving a phone number, so you can simply say "No thanks" and carry on.

California goes further. Under the Song-Beverly Credit Card Act, shops generally can't ask for personal details such as your phone number and record them as part of a credit card purchase. There are exceptions, for example when the number is needed for delivery, installation or a special order.

In the UK, the Information Commissioner's Office says businesses need your consent to send marketing texts. There's one exception for existing customers, and even then they must give you a clear chance to opt out when they take your details and in every message.

When It's Worth Giving a Number

Sometimes it's genuinely useful:

• Delivery or installation. The courier or fitter needs to reach you.
• Repairs and special orders. The shop needs to tell you when it's ready.
• Big purchases. Warranty and recall notices can matter.
• A loyalty scheme you'll actually use. If you shop somewhere every week, the savings can add up.

The question isn't whether to give a number. It's whether to give your real number.

The Easy Fix: A Number Just for Sign-Ups

Keep your personal number for friends, family, your bank and your doctor. For everything else, such as loyalty cards, store accounts, raffles, wifi sign-ins and online orders, use a second number:

• You still get the discount. The loyalty account works the same, because it's still a real number.
• Marketing texts land somewhere else. They go to the second number, not the phone in your pocket.
• Your personal number stays out of shop databases. It doesn't get matched against your other accounts.
• You can release it. If the spam gets out of hand, drop the number and start fresh. Nobody important has it.

A TINE number is a real US, UK or Canadian number that you use in your browser, so you don't need a second SIM or phone. It costs from $5 a month, with no ID needed. Some services, often banks, refuse all virtual numbers, so use your real number for those, and test any sign-up that matters to you first.

How to Say No Without Feeling Awkward

Cashiers ask because they're told to, so a quick, friendly answer is fine:

• "No thanks, I'll skip that."
• "I'd rather not, but thanks."
• "Can I just use my email for the receipt?"
• Or simply give your sign-up number instead.

If the cashier says the system needs a number, ask if they can skip the field. Often they can.

Frequently Asked Questions

Can a shop refuse to sell to me if I don't give my number?

For an ordinary purchase, very rarely. You can always pay without joining a loyalty programme. In California, shops generally can't require your phone number to complete a credit card sale.

Is it safe to give my number for a digital receipt?

It's usually harmless, but it often signs you up for marketing too. Ask for an email receipt instead, or use a second number.

Will a shop know it's a second number?

Usually not. A cashier or loyalty system just sees a phone number. Some online services check whether a number is virtual and refuse it, so if a loyalty app won't accept it, use another number for that one.

What about online checkout?

The same logic applies. Delivery services may genuinely need a number to reach you, but you can still use a second number for that and keep your personal one private.

The Bottom Line

Your phone number is worth more to a shop than the discount it offers you. You can usually just say no. If you want the perks anyway, give a number you keep for sign-ups, not the one your family calls.

More on keeping your number private: can someone find your address from your phone number? and selling on Facebook Marketplace without your real number.