Whether you are trying to verify a Telegram account, set up a marketing profile, or just protect your personal phone number from data breaches, you have probably considered masking your real number. The three most common approaches are virtual numbers, eSIMs, and burner apps. But they are not interchangeable, and picking the wrong one can leave you locked out of accounts or expose the very data you wanted to protect.
A virtual number is your best bet when you simply need to receive SMS verification (OTP) codes without tying your identity to a physical SIM. This guide breaks down how each option works, what they cost, and the privacy and legal implications—so you can make an informed choice.
How Virtual Numbers, eSIMs, and Burner Apps Work
Virtual Numbers
A virtual number (sometimes called a VoIP number) exists entirely in the cloud. There is no physical SIM card tied to it. Services like NumsGo provide on-demand virtual numbers in over 150 countries specifically designed to receive SMS verification codes. You rent the number for a single activation or a short period, receive your code in a web dashboard, and the number is recycled afterward.
eSIM
An eSIM is a digital SIM chip embedded directly into your smartphone or device. Unlike a virtual number, an eSIM connects to a real cellular network. You download a carrier profile via a QR code or an app, and your device authenticates with the network just as it would with a physical SIM. eSIMs are tied to real mobile network operators (MNOs) and use actual cellular infrastructure.
Burner Apps
Burner apps operate similarly to virtual numbers—they provide a secondary VoIP number you can use from an app on your primary phone. The name comes from the idea that you can "burn" or dispose of the number when you are done with it. While convenient for temporary use, they route calls and texts over data networks and share many of the same limitations as standard VoIP virtual numbers.
Cost Comparison
Cost is often the deciding factor, especially if you need to verify multiple accounts across different regions. Here is how the pricing models typically break down:
- Virtual Numbers: Highly cost-effective. One-time SMS activations usually cost between $0.10 and $2.00 depending on the country and target service. Number rentals for extended use are also inexpensive compared to cellular plans.
- eSIM: Priced like traditional cellular plans. A short-term data package (e.g., 1 GB for 7 days) typically costs $4 to $10. If you need a number that can receive SMS, you often pay a premium, sometimes $15 to $30 per month.
- Burner Apps: Subscription-based. Most charge $4 to $10 per month for a single number, or offer prepaid credits. The costs add up quickly if you need multiple numbers for different services.
| Feature | Virtual Number (e.g., NumsGo) | eSIM | Burner App |
|---|---|---|---|
| Typical Cost (SMS) | $0.10 – $2.00 per code | $15 – $30 / month | $4 – $10 / month |
| Hardware Required | None (web-based) | eSIM-compatible device | Smartphone (app) |
| Primary Use Case | OTP verification | Mobile data / travel | Temporary voice/text |
| Network Type | VoIP / Cloud | Cellular (MNO) | VoIP / Cloud |
Privacy Implications
Privacy is the main reason people seek alternatives to their personal number. According to the FTC, data breaches exposed millions of records in recent years, and phone numbers are frequently used to link and deanonymize user identities across different platforms.
- Virtual Numbers: Offer strong compartmentalization. Because you do not need to provide your real number, there is no direct link back to your identity. Services like NumsGo allow you to pay via cryptocurrency (BTC, ETH, USDT, SOL, LTC), which adds another layer of anonymity since you do not need to attach a credit card to your account.
- eSIM: Provides moderate privacy. While the number is not your primary one, registering an eSIM profile often requires an email and payment details. Additionally, because eSIMs are tied to real carriers, they can be subject to carrier-level surveillance or data requests.
- Burner Apps: Privacy varies widely. Many burner apps require an account with an email, and some track your usage metadata. Because they rely on app stores for distribution, your download and purchase history could link back to you.
SMS Verification and Calling Capabilities
Not all numbers are created equal when it comes to account verification. Many major platforms actively block VoIP numbers.
Receiving SMS (OTP)
This is the critical differentiator. Services like WhatsApp, Telegram, and banking apps often check the carrier type of the number. Because eSIMs connect to real mobile networks, they almost always pass carrier verification checks. Virtual numbers and burner apps, however, are frequently flagged as VoIP and rejected.
NumsGo mitigates this by sourcing numbers through a vast network that includes real mobile ranges where possible, supporting successful verification for over 1,000+ services. If a number fails to receive the code within the activation window, the service provides an auto-refund to your wallet, ensuring you do not pay for failed attempts.
Making and Receiving Calls
- Virtual Numbers: Designed primarily for inbound SMS. Outbound and inbound voice calls are generally not supported.
- eSIM: Fully supports voice calls and SMS, assuming your chosen plan includes voice minutes.
- Burner Apps: Supports VoIP calling, but call quality depends on your internet connection.
Legal Status by Region
The legality of using secondary numbers depends heavily on your location and your intent. While using a virtual number or eSIM for privacy, testing, or business management is legal, using one to commit fraud or evade legal investigations is universally prohibited.
- United States & Canada: Using virtual numbers and eSIMs is entirely legal. The FCC regulates VoIP services, requiring providers to adhere to communications standards. However, you must still comply with platform terms of service.
- European Union: Legal, but eSIM and telecom providers must comply with GDPR, meaning your data is heavily protected but also documented. The EU Commission enforces strict rules on how telecom data is stored.
- India: The Telecom Regulatory Authority of India (TRAI) mandates that all mobile connections—physical or eSIM—be linked to a valid Aadhaar ID. Virtual numbers for OTP are generally permitted, but you cannot use them to bypass local KYC requirements.
- China: Virtual numbers are tightly controlled. eSIMs for consumer devices are restricted, and VoIP numbers from foreign providers are routinely blocked by local services.
Decision Guide: Which Should You Choose?
Choosing the right tool comes down to your primary objective. Here is a simple framework to help you decide:
- If you only need to receive SMS OTP codes for account verification: Choose a virtual number. It is the cheapest, fastest, and most private option. Services like NumsGo let you grab a number, get your code in seconds, and discard the number without ever exposing your real identity.
- If you are traveling abroad and need mobile data + a local number: Choose an eSIM. It connects directly to cellular networks, ensuring you get reliable data and can verify services that strictly block VoIP numbers.
- If you need a temporary number for short-term voice calls and texts (e.g., Craigslist, dating apps): Choose a burner app. It offers a good balance of convenience for disposable communication, though it may fail for strict OTP verification.
For developers and growth teams looking to automate account verification at scale, virtual numbers are the clear winner. NumsGo offers a REST API for SMS verification that allows you to programmatically order numbers and poll for codes, making it easy to integrate into your QA or onboarding workflows.
Key Takeaways
- Virtual numbers are the most cost-effective and private solution for receiving SMS OTP codes, typically costing $0.10 to $2.00 per verification.
- eSIMs provide real cellular connectivity (data + voice + SMS) but are more expensive and require a compatible device.
- Burner apps are convenient for temporary VoIP calls but are frequently blocked by services that reject VoIP numbers.
- Always check local regulations regarding KYC and telecom registration, especially in regions like India and China.
- For automated or bulk verification, use an API-driven virtual number service rather than manual burner apps.
Frequently Asked Questions
Can I use a virtual number to verify WhatsApp or Telegram?
Yes, in most cases. Virtual number services like NumsGo specifically support OTP verification for apps like WhatsApp and Telegram. However, because some platforms occasionally block known VoIP ranges, success rates can vary. NumsGo offers an auto-refund if the number fails to receive the code, so you are not charged for failed attempts.
Is an eSIM more secure than a virtual number?
It depends on your threat model. An eSIM connects to a legitimate cellular network, which means it is less likely to be blocked by services, but it is also tied to carrier infrastructure and subject to lawful interception or data requests. A virtual number offers better compartmentalization for privacy, especially when paid for via cryptocurrency.
Why do some apps reject virtual numbers?
Many financial institutions and social media platforms maintain databases of VoIP and virtual number ranges to prevent fraud and spam. When you attempt to verify a VoIP number, their system flags it and blocks the SMS. Virtual number providers constantly refresh their number pools to include mobile ranges that bypass these filters.
Can I make phone calls with a virtual number?
Generally, no. Virtual numbers provided by SMS-activation services are optimized solely for receiving inbound text messages. If you need to make outbound calls or receive voice calls, you should look into an eSIM or a dedicated VoIP provider.
Is it legal to use a virtual number for online verification?
Yes, using a virtual number for privacy, business testing, or account management is legal in most jurisdictions. However, it is illegal to use virtual numbers to commit fraud, misrepresent your identity for financial gain, or evade law enforcement investigations. Always comply with the terms of service of the platform you are verifying.