How to get a second phone number without a second SIM
Open the numbers list on ASMS.ai and pick one that is currently active. There is no SIM to insert, no carrier plan to add, and no phone settings to touch, the number lives on the ASMS.ai page, not in a phone's SIM tray.
Give that number to whatever needs it: an app's verification form, a sign-up page, a work contact who does not need your personal line. Incoming SMS appears on the number's public page as soon as it arrives, no notification setup required.
For occasional or one-time use, the free shared numbers cover it completely. For a second phone number you will use more than once, work calls of your own, ongoing verification, a small paid upgrade gives you a private inbox instead of a shared one.
Free second phone number vs a second phone number app
Most second phone number apps ask for an account, a subscription, and often a monthly minute allowance before you get a usable line. ASMS.ai's free tier needs none of that: no registration, no card, no recurring charge, just a number and an inbox.
The trade-off on the free tier is that numbers are shared and public. Anyone else on the site can pick the same number and read the same messages. That is entirely fine for receiving a one-time OTP or trying out a service, and not the right fit for a number you want to protect.
When privacy matters, a dedicated private number is priced per code (VoIP High Quality at $0.50, Non-VoIP AT&T at $0.99) or as a rental from $4.49 for longer stretches, days up to months, with no subscription attached. A paid code that never arrives is refunded automatically.
Why people want a second phone number
Separating work from personal life is the classic case: a freelancer or small business owner wants clients calling one line and family texting another, without carrying two phones or paying for two plans. A rented private number covers that cleanly.
Keeping a personal number off sign-up forms is just as common. Every account you create with your real number is one more place it can leak, get sold to a data broker, or start receiving spam calls. A second number, free or private, absorbs that exposure instead.
Developers testing multi-account or SMS-verification flows need a fresh 2nd phone number repeatedly without burning through SIM cards. The REST API and native MCP server extend the same pool to automated pipelines and AI agents that need to complete a phone verification step on their own.
Choosing free, private, or a longer rental
Go free when you need a number once: an app sign-up, a marketplace verification, testing a form. The shared, public inbox is a non-issue for a code you will use and forget within minutes.
Go private, per code, when you need one more layer of privacy for a single sensitive verification. VoIP High Quality runs $0.50 and Non-VoIP AT&T $0.99, both pay-per-code with no subscription.
Go with a rental, starting at $4.49, when you want an actual second phone number you can hand out and keep receiving SMS on for days, weeks, or months, closer to how a real second line behaves, without the contract.
Privacy, trust, and what happens to the number after
ASMS.ai does not require an account or personal details to use the free tier, so nothing is being collected just because you looked up a number. The service has run continuously since 2018 under the AnonymSMS name before rebranding, which is longer than most free-number sites survive.
Numbers are never resold. Once a paid number has done its job, it is released back to the carrier instead of being handed to the next customer behind your back, and if a paid code never lands, you get an automatic refund rather than having to ask for one.
The one caveat: free shared numbers are public by design. Fine for a verification code, not appropriate for anything you would not want a stranger glancing at. Rentals and pay-per-code private numbers exist precisely for the cases where that matters.