Danish +45 numbers for OTP codes and sign-up testing

Testing Danish phone verification before you go live

Denmark is one of the easier markets to validate phone numbers for, which is exactly why small mistakes slip through. Every Danish number is eight digits. There are no area codes, no trunk 0, and the first digit isn't a dependable way to tell a mobile from a landline, so don't build rules around it.

A few points to confirm on a real +45 number:

• Neighbors with their own codes. The Faroe Islands use +298 and Greenland +299. A country dropdown that files them under Denmark will mangle those users' numbers.
• Danish letters in the template. Æ, Ø and Å belong to the standard SMS character set, so a Danish OTP message doesn't get pushed into Unicode the way many other languages do. Check that your provider isn't converting them anyway and shrinking the segment.
• Formatting on display. Danes usually write numbers in pairs of two digits. If your UI reformats input, make sure the stored value stays clean E.164.

Driving +45 numbers from your test suite

Instant OTP is fully available over OTP Bolt's REST API. Issue an API key, then let your end-to-end tests order a Denmark number for the service being checked, poll until the code arrives, and cancel the order when a run breaks partway.

Costs behave the same as in the browser. Each order has 20 minutes. No delivery in that time, or a cancellation before the code turns up, means the full price returns to your wallet; you are charged only for codes that were received. Keys and docs are in the developer section.

Apps you can verify with a Denmark virtual number

Instant OTP for Denmark currently covers more than 1,700 apps. Among them: WhatsApp, Telegram, Signal, Viber, Google (Gmail and YouTube), Facebook, Instagram, TikTok, Snapchat, X (Twitter), ChatGPT, Claude, Microsoft and Outlook, LinkedIn, Amazon and Airbnb.

Routes change over time, so confirm the app in your dashboard before you order. The price for each app in Denmark starts from $0.20 per code.

Getting a +45 code without writing any code

Just need a Denmark phone number for verification once? The Instant OTP flow looks like this:

1. Open an account with your email plus a 6-digit confirmation code, or use Google.
2. Put money in your wallet. That first top-up unlocks ordering and shows real prices.
3. Choose the app, then Denmark.
4. Type the eight-digit number (with +45) into the app.
5. Keep an eye on the live inbox; the OTP generally arrives within a minute or two.

If the Danish SMS is missing

Check the field first, before blaming OTP Bolt or the app. A stray 0 in front of the eight digits, or 45 typed twice, is enough to send the code into the void.

Next, ask the app to resend. Some orders also allow a further SMS on the same number from your dashboard. A handful of services won't accept virtual numbers, and that is the case the refund rule covers: if 20 minutes pass with no code, or you cancel before it arrives, the whole amount goes back to your wallet with no request needed. Trying a different country for the same app is a sensible next step.

When a dedicated Danish number makes more sense

Instant OTP handles one code and then it's done. For anything you'll come back to (two-step logins, account recovery, a Danish contact number for your business) choose a Dedicated Number. Prices start from $1.95/month on prepaid terms, renewed from the wallet after an email reminder, and you can release the number at any time.

A dedicated line gives you an SMS inbox for unlimited verification texts, calling from Chrome, Edge, Firefox or Safari with no SIM or app, inbound calls that ring in your browser, and a call log.

Danish lines aren't sold off the shelf; the instant, self-serve option is limited to the United States, Canada and Puerto Rico. Use "Request a country" in the dashboard, and the team will confirm whether a +45 number is available, what it costs, and whether Danish rules require an address or ID check before activation. Timing varies. Feature details: Dedicated Numbers.

Entering a +45 number and who tends to need one

Choose Denmark (+45) from the country list and type the eight digits straight through. In a single free-text field, write +45 and then the eight digits with no spaces. Nothing needs removing, since Danish numbers never start with a trunk 0.

Danish is the official language, and English is widely understood. The app that sends your code decides the language, so the same service may text you in Danish or English depending on your account settings.

People who look for a Denmark virtual number include Danes working elsewhere in Europe who keep accounts linked to home, international students and new arrivals in Copenhagen or Aarhus who want a second number before their own SIM is set up, Nordic businesses separating work sign-ups from personal phones, and developers validating an app for Danish users.

How payment works

OTP Bolt uses a prepaid wallet in US dollars. You can top it up by card via Stripe checkout or with USDT or USDC. After the first top-up you can place orders and see exact Danish prices, and a PDF invoice is emailed for each payment.

App names are trademarks of their owners. OTP Bolt is not affiliated with them. Follow each app's terms.