numstack

Numstack Terms of Service

Effective date: 26 September 2026

1. Agreement

These terms govern Numstack services provided by NSS Software Ltd., United Kingdom, at 128 City Road, London, EC1V 2NX, United Kingdom. Contact: support@nsssoftware.co.uk.

The account agreement begins when you accept these terms and register, and continues until closure. Each top-up becomes binding when accepted for processing and confirmed in the app. Acceptance does not confirm delivery. Mandatory consumer rights remain unaffected.

Personal data is processed under our Privacy Policy. Analytics consent is separate from acceptance of these terms.

2. Eligibility and use

You must be 18 or older, provide accurate information and protect access to your account. Report suspected unauthorised access promptly. You are responsible for instructions you authorise.

Only add numbers that belong to you. Ownership is not independently verified. Check the number, operator and amount before confirming a top-up.

Fraud, unlawful use, unauthorised access, interference with the service and circumvention of security or payment restrictions are prohibited.

3. Services

Numstack provides supported mobile airtime top-ups, schedules and reminders. Availability depends on the country, operator and supplier. Virtual numbers and eSIM products marked Coming soon are unavailable.

Top-ups are delivered through third-party suppliers and operators. Operator terms govern airtime use and expiry. We remain responsible for our contractual obligations. We do not guarantee continued number availability, SIM activity, receipt of verification messages or reminder delivery, and do not provide the operator's current balance or expiry date.

4. Payments and fees

The Numstack Balance is credit for Numstack purchases, separate from your mobile operator's balance. Payments are in USD, processed through Stripe and credited after confirmation. Ordinary withdrawals and transfers are unavailable. Refunds are governed by sections 6 and 7.

The service fee is 20% of the top-up amount, minimum $0.99, rounded up to the next cent and added to the top-up amount. Your first successful top-up has no service fee. The total, including our fees and applicable taxes, is shown before authorisation. Your bank or payment provider may impose separate charges or currency conversion.

Local-currency amounts shown before delivery are estimates. Changed quotes require confirmation before purchase. An authorised charge cannot be increased retrospectively; higher charges outside an existing schedule's authorisation require your agreement.

5. Scheduled and pending top-ups

Enabling a schedule authorises recurring top-ups and disclosed fees from your Numstack Balance using your account time zone. Funding the balance requires a separate payment instruction. Changes and pauses affect future operations only. Insufficient funds prevent the top-up and pause the schedule until you resume it.

Top-ups are performed within the agreed time or, otherwise, a reasonable time. An uncertain result remains pending while investigated. The amount and fee are unavailable during processing and become available again if the top-up is not completed. This does not refund the original payment method.

6. Cancellation and refunds

A started top-up cannot be cancelled in the app. Contact support about incorrect details, duplicate charges or undelivered top-ups. Delivered airtime may be unrecoverable. This does not exclude remedies for our failure or mandatory cancellation rights.

Where required by law, we will correct or repeat the service, reduce the price or provide a refund. Supplier investigations do not extend statutory deadlines.

For UK consumer service contracts covered by the Consumer Contracts Regulations, you may cancel within 14 days of the contract by sending a clear cancellation notice to support@nsssoftware.co.uk. The form below is optional; other legally valid notices remain accepted.

Performance during that period requires your express request. The cancellation right ends on full performance only with your prior acknowledgement. A proportionate charge for partial performance applies only where legally permitted. Accepting these terms alone does not provide that request or acknowledgement.

Qualifying cancellation refunds are made without undue delay and within 14 days of notice, to the original payment method without a refund fee. Other applicable statutory rights and deadlines remain unaffected.

7. Account closure

Request deletion in Account → Settings; no additional email is required. The request is irreversible, ends access and stops future schedules. Pending operations and obligations must be resolved before final closure.

We manually return the unused balance to the original payment method without a closure fee. We may require proportionate verification. Refunds from multiple payments are allocated to the original payments without exceeding each payment. If the original method is unavailable, we resolve the return with the payment provider. Payments to arbitrary third-party accounts are unavailable.

Returns remain subject to applicable statutory deadlines. We explain delays and disputed amounts. Account deletion does not extinguish an outstanding refund entitlement.

We email you when deletion is complete. Data retention is governed by our Privacy Policy. Re-registration does not restore the deleted account.

8. Suspension and changes

We may restrict access where reasonably necessary for suspected fraud, serious breach, security or legal requirements. We explain the reason and how to challenge the restriction unless prohibited by law or prejudicial to an investigation. Restrictions do not automatically forfeit your balance.

If we discontinue the service, we give reasonable notice where practicable and settle unused funds under section 7.

We may amend these terms at any time to reflect changes in law, security requirements or our services. Revised terms take effect on the date stated in the published version. Separate notice and consent will be provided or obtained where required by applicable law. Changes do not affect accrued rights or previously authorised charges. You may close your account under section 7 if you do not accept revised terms.

9. Intellectual property and liability

We grant permission to use the app for Numstack services. Intellectual-property rights remain with us and our licensors. Copying, resale and modification are prohibited except as permitted by law. Applicable App Store licence terms also apply.

We are responsible for reasonably foreseeable loss caused by our breach or failure to exercise reasonable care and skill. We do not exclude liability for fraud, fraudulent misrepresentation, death or personal injury caused by negligence, mandatory service-quality rights or other liability that cannot lawfully be excluded.

For events beyond our reasonable control, we take reasonable steps to mitigate their effects. Rights to cancel or recover payment for undelivered services remain unaffected.

10. Complaints and governing law

Send complaints to support@nsssoftware.co.uk. We handle complaints in accordance with applicable law.

The law of England and Wales applies, without limiting mandatory consumer protections in your country of habitual residence. Its courts have non-exclusive jurisdiction; any right to use your local courts remains unaffected. No compulsory arbitration or waiver of collective proceedings applies.

Invalid provisions do not affect the remainder where it can operate fairly. Delayed enforcement is not a waiver. Assignment must not reduce your rights; we will notify you if it affects your account.

Optional cancellation form

To: NSS Software Ltd. (address in section 1); support@nsssoftware.co.uk.

I/We give notice cancelling the following service contract: