Substack SMS Verification — Receive Your OTP Code
Most Substack accounts sign in by email, so you may not need a number at all. When Substack does ask for one, Signival gives you a temporary non-VoIP number to receive the OTP. Pay in Naira or crypto.
Substack signs you in with an emailed link or a password, so many readers and writers never give it a phone number. A number comes up in the app, for example when you sync your contacts, which Substack says needs a text-message check first, and users have reported a phone check before replying in Chat. It sends a one-time password (OTP) by SMS, a temporary code you enter to continue. If you would rather not use your personal SIM, Signival gives you a temporary non-VoIP phone number that receives the Substack SMS verification code and shows it in your dashboard.
Because a number is optional for most of Substack, this guide is partly about when it is worth using one. It explains where Substack asks, how to receive a Substack OTP with Signival, how to remove the number afterwards, and why age checks and payments are separate things that a rented number does not solve.
Why Substack Asks for a Phone Number
Substack says you sign in by requesting a sign-in link to your email or by using your password. A phone number is not how you get in, which is why many accounts never have one.
Substack says that syncing your contacts in the app means first verifying your phone number by text message. It says matching is two-sided: when a friend who has your number or email syncs their contacts, both of you can be prompted to connect.
Substack’s privacy policy says that if you provide a phone number, it may use a third-party provider to verify it by SMS, and that this information is used only for verification and not shared for marketing. Users have also reported a ‘phone verification required’ prompt when replying in Chat, with the number added through the app.
When Substack May Ask for a Phone Number
Syncing your contacts
In the Substack app you choose Find friends or Add friends, then Connect next to Contacts. Substack first asks you to verify your number by text.
Replying in Chat
Users report a prompt saying phone verification is required to continue a chat, with the number added through the app. Check what Substack asks for on screen.
Two-step verification
Substack’s help describes two-step verification through an authenticator app, and says you must first turn on recovery questions. No phone number is involved.
Need a Substack Verification Number?
Get an available number for Substack, receive the SMS verification code, and complete your activation through your Signival dashboard.
Can a Temporary Number Receive Your Substack OTP?
An OTP number is a temporary phone number, sometimes called a virtual number, that receives text messages without a SIM in your phone. For Substack it can receive the verification code by SMS.
We could not find a rule about VoIP or virtual numbers in the Substack help pages we reached. Signival numbers are sourced from mobile operators rather than internet-based VoIP lines, but Substack runs its own checks, so there is no guarantee.
A rented number is a lighter risk here than on most apps, because the number is not how you sign in. Substack says you can remove it: in your settings, click Remove next to the phone number on file, and it is deleted from your account. Your email still gets you back in.
Two things a rented number does not solve. Substack says that in some regions it asks you to verify your age, with a selfie or a government ID rather than SMS. And paid publications connect to a payment processor that runs its own identity checks. Use your own details for those.
How to Receive a Substack OTP Code With Signival
Create an account and fund your wallet
Sign up on Signival and add funds with cryptocurrency or in Naira.
Choose Substack and a country
Search for Substack in SMS Verification and pick a country. Check the live price and availability first.
Enter the number in Substack
When the Substack app asks you to verify a phone number, enter your country code and the number, and ask for the code by text.
Enter the code
When Substack sends the text, the code appears in your Signival dashboard. Type it in before the activation ends.
Remove the number afterwards
In your Substack settings, click Remove next to the phone number on file once you are done, so a number you no longer control is not attached to the account.
Countries for Substack SMS Verification
These are common countries for receiving a Substack OTP code. Substack does not publish a list of preferred number countries in the pages we reached. Enter your country code and number exactly as Substack asks. Availability and prices on Signival change, so check the live listings.
| Country | Dial code | Price | Note |
|---|---|---|---|
| United States | +1 | from ₦150 | A large pool and a common first attempt. |
| United Kingdom | +44 | from ₦150 | A common alternative if a US number is refused. |
| Canada | +1 | from ₦150 | Same +1 prefix as the US, with its own number pool. |
| Germany | +49 | from ₦150 | A European option. |
| India | +91 | from ₦150 | Check the listing for current rates. |
| Nigeria | +234 | from ₦150 | For writers based in Nigeria. |
| Ghana | +233 | from ₦150 | For writers based in Ghana. |
| South Africa | +27 | from ₦150 | For writers based in South Africa. |
| Cameroon | +237 | from ₦150 | For writers based in Cameroon. |
Signival offers numbers from 70+ countries in total, Naira and Crypto Payment accepted. Check the pricing page for live availability.
Flexible Payment Options for Customers in Any Country
Signival supports customers in Nigeria and other countries with payment options designed for different markets.
🇳🇬 Nigerian Customers
Fund your Signival wallet using supported local payment methods and pay for verification services in Nigerian Naira (NGN).
🌎 Customers Worldwide
Customers in any country, including Ghana, South Africa, Cameroon, Canada, the USA, the UK, Germany and India, can fund their wallets with supported cryptocurrency, so you do not need a Nigerian bank account.
What Signival Offers for Substack SMS Verification
Temporary OTP Numbers
Temporary non-VoIP phone numbers for receiving one-time password (OTP) codes by SMS during an active activation session. The number lasts for the activation rather than working as a permanent personal phone line.
Multiple Country Options
Depending on current inventory, you can choose from available country codes when requesting a Substack verification number, so you can pick one that fits your setup.
Flexible Wallet Funding
Nigerian users can fund in Naira using local payment methods. Customers in any country can fund with cryptocurrency. Your balance can then be used for supported verification services.
Instant OTP Delivery
Once an SMS reaches the assigned number, the verification code is displayed in your Signival dashboard, so you manage the number and the incoming message from one place.
Tips for Receiving Your Substack SMS Code
- Check whether you need a number at all. Substack signs you in by email link or password. If you only want to read or publish, you may never be asked for a number.
- Add the number in the app. Contact sync and the Chat prompt both route through the Substack app, and users report the number cannot be added from the web.
- Use an authenticator app for two-step verification. Substack’s help describes an authenticator app for two-step verification. It does not depend on a rented number.
- Remove the number when you are done. Substack lets you remove the number on file in your settings. Do it before a rented number is reassigned.
- Never share the code. A code is only ever for you to type into Substack. Anyone who asks you to read one out is trying to take over the account.
If Your Substack OTP Code Does Not Arrive or Is Rejected
The SMS does not arrive
Check the country code and digits, wait through the activation window and request the code once. If nothing arrives within 5 minutes, cancel for a refund.
Substack will not accept the number
Check the country code and digits. If they are right, Substack may not accept the number, so cancel and try one from another country.
You cannot add a number on the web
Users report the number can only be added through the Substack app. Install it and add the number there.
You want the number off your account
Open your settings and click Remove next to the phone number on file. Substack says it is then deleted from your account.
You are asked to verify your age instead
That is a different check. Substack says it uses a selfie or, after failed attempts, a government ID in some regions. A phone number does not satisfy it.
Frequently Asked Questions
How do I receive a Substack OTP code without my personal number?
Fund your Signival wallet in Naira or with cryptocurrency, choose Substack and a country in your dashboard, and enter the temporary number you are given when the Substack app asks for a phone number. Request the SMS, and when Substack sends the one-time code it appears in your dashboard for you to type in.
Does Substack accept temporary, virtual or VoIP numbers?
In the help pages we could reach, Substack does not describe a rule about virtual or VoIP numbers. A temporary number that receives SMS can complete that route.
Are Signival numbers non-VoIP?
Signival numbers are sourced from mobile operators rather than internet-based VoIP lines. Substack does not publish rules about number types in the help we could reach. Substack runs its own checks.
Can I get a free OTP number for Substack?
Signival numbers are paid, starting from 150 naira. A free public number is shared by many people, so anyone can read the code sent to it. For an account that holds your readers or earnings, that is a risky choice.
Do I need a phone number for Substack?
Usually not. Substack says you sign in with an emailed link or a password. A number comes up for contact syncing, and users report it for Chat, so check what Substack asks for on screen.
Why is Substack asking me to verify my phone number?
Substack says syncing your contacts needs a text-message check first. Users have also reported a prompt before replying in Chat. Substack’s privacy policy says it may use a third-party provider to verify a number by SMS.
How do I remove my phone number from Substack?
Open your account settings and click Remove next to the phone number on file. Substack says the number is then deleted from your account.
Does Substack use my phone for two-step verification?
Substack’s help describes two-step verification through an authenticator app. It says you must first turn on recovery questions in your settings.
What happens if my Substack OTP code does not arrive?
If the SMS does not arrive before the activation expires, the request is closed under the applicable service and refund terms, and eligible failed activations may qualify for a wallet refund. Check the activation status and refund conditions shown on Signival before you order.
Can I use Signival for Substack SMS verification from any country?
Yes. You can fund your wallet with cryptocurrency from any country, or in Naira if you are in Nigeria. Signival offers numbers from 70+ countries, including the USA, UK, Canada, Germany, India, Nigeria, Ghana, South Africa and Cameroon. Check the pricing page for live availability.
Receive Your Substack OTP Code with Signival
If you need a temporary number to receive a Substack SMS verification code, Signival gives you a simple way to get an available number, receive the OTP, and manage the activation from your dashboard.
Fund your wallet in Naira or crypto, select Substack, choose an available country, and receive your verification code through the Signival interface.
Have questions? Contact support or check current pricing.