Testing Finnish (+358) SMS verification with an OTP routing API

Which services can a +358 number verify at the moment?

The Finnish route currently lists more than 2,800 services. Among the ones teams ask about most are WhatsApp, Signal, Telegram, Google (Gmail & YouTube), Microsoft & Outlook, LinkedIn, Discord, Uber, Amazon, ChatGPT (OpenAI), Claude, Netflix and Airbnb.

Treat that list as a snapshot rather than a promise. Availability on each route moves during the day, which is exactly why GET /api/v1/prices reports it live alongside the price instead of leaving you to guess from a static page.

What does the Finland OTP API sequence look like?

Everything runs against https://otproute.com/api/v1 with a Bearer key prefixed or_live_, created in the Developer console. Finland's country id is fi.

1. Look up service ids once with GET /api/v1/services and confirm fi in GET /api/v1/countries.
2. Ask GET /api/v1/prices?country=fi&service=<id> for the current price and availability.
3. Order through POST /api/v1/activations with a body like {"service": "signal", "country": "fi"}; the reply holds an activation id and the +358 number.
4. Type that number into the sign-up or login screen of the app you are testing.
5. Let your webhook pick up activation.sms_received for that activation, or poll GET /api/v1/activations/{id} instead. Abandon a stuck run with POST /api/v1/activations/{id}/cancel.

The API reference lists every field, and the account limit of 300 requests per minute leaves plenty of room for polling.

How should Finnish phone numbers be stored and normalized?

Finns write mobile numbers with a leading trunk 0, so a local number typically starts with 04 or 050. In E.164 that zero disappears: the stored value becomes +358 followed by the remaining digits, for example +35840… rather than +358040…. Number lengths in Finland are not uniform, so validate against a library such as libphonenumber instead of a fixed digit count.

Finland has two official languages, Finnish and Swedish, and many apps also offer English. The text around a code generally follows the app's own locale setting, so a localization pass is worth running in all three. Teams use a +358 number for testing when launching a Nordic product, checking Finnish and Swedish SMS templates, or reproducing a login bug reported by a customer in Helsinki or Turku.

Is there a no-code way to get a Finnish verification number?

Yes. Support, growth and operations staff can work entirely in the dashboard after they create an account:

• choose Finland and the service you need;
• check the price displayed before ordering, then confirm;
• copy the +358 number into the app's verification step;
• watch the activation card, where the code appears once it lands.

If nothing comes through, the full amount returns to the wallet when the 20-minute window ends, or straight away if you cancel.

Can my team keep a long-term Finnish line?

Not as a self-serve product. Dedicated Virtual Numbers, the lines you keep while they renew, are sold only for the United States and Canada, from $1.95/month, with inbound and outbound SMS plus browser calling. For Finland the OTP Gateway handles one code per number. If you need a lasting +358 line, email [email protected] and the team will check what local rules allow; there is no promise one can be arranged. The guide to temporary vs dedicated numbers helps decide which model a test actually needs.

How do payments work for +358 testing?

There is a single prepaid USD wallet and no monthly fee or plan. You can load it by card or with USDT/USDC stablecoins, and each top-up produces a PDF invoice sent by email. Current rates sit on the pricing page. Before wiring Finland into CI, ask to have your development account switched to sandbox, which returns simulated numbers and codes so the full flow can run without touching wallet funds. Once the sandbox run passes, switch the same code to a live key and check GET /api/v1/balance at the start of each suite, so a pipeline stops early instead of failing halfway through a Nordic regression pass.

Frequently asked questions

Can I test my app's Finnish sign-up flow without a local SIM?

Yes. Order a +358 number for your service from the OTP Gateway, enter it in your own sign-up form, and read the code in the dashboard or through the API.

Should the leading 0 be included when a Finnish number goes into a form?

Only if the form expects national format. In international format you drop the 0 and write +358 followed by the rest, which is also the safest way to store it.

Will the verification text arrive in Finnish or Swedish?

It depends on the sending app and the language the account is set to. Many services default to English, so check templates in all three languages if you localize.

What should I do if no code reaches the Finnish number?

Let the 20-minute window run to the end so the refund triggers, then try again a bit later or pick another service route. Bear in mind that a few services refuse virtual numbers, and firing off new orders back to back seldom changes the outcome.

How do I verify webhooks for Finland activations?

Compute HMAC-SHA256 over <t>.<raw body> with the endpoint secret and compare it to the v1 value in X-OTPRoute-Signature, rejecting stale timestamps. Our post on securing OTP webhooks walks through it.

Does OTP Route promise that every Finnish service accepts its numbers?

No, nothing is guaranteed, because each service decides which numbers it accepts. That uncertainty is why unused activations are refunded automatically.

How many services can be verified on a +358 route?

More than 2,800 at the moment, though the figure shifts as inventory changes. Read the live list from the API or the dashboard before a test run.

Are there usage rules for Finnish numbers?

Use them only for your own products and legitimate business accounts, follow each service's terms, and keep to the OTP Route Acceptable Use Policy. Creating accounts in bulk is not allowed.

Service names are trademarks of their respective owners. OTP Route is not affiliated with them. Use numbers lawfully, follow each service's terms and our Acceptable Use Policy.