Temporary virtual number vs a prepaid SIM card
A prepaid SIM is the traditional way to get a second number: buy a pay-as-you-go SIM, put it in a phone, and you have a new line. It is still the most reliable option for accounts you plan to keep. A temporary virtual number takes a different approach, giving you a number in a web dashboard for one sign-up. This page compares the two on setup effort, acceptance, how long the number lasts, what happens if you stop paying, and which one is a better fit for different kinds of accounts.
Quick answer
A prepaid SIM card gives you a real mobile number you control, with calls, texts and the ability to receive codes for as long as you keep it topped up. It needs a phone and an ongoing plan. A temporary virtual number from Noir SMS is a mobile number rented online for one verification. For an account you will keep, a prepaid SIM is safer; for a single code, a temporary number is quicker.
Side by side
Why a prepaid SIM is the safest long-term option
A prepaid SIM number belongs to you as long as your plan stays active. Apps can send you new login codes, password resets and security alerts months later. For your main messaging app, an email account you rely on, or anything with money or personal data attached, that continuity matters more than convenience.
The practical downsides
You need a spare phone or a dual-SIM phone, a store visit or delivery, and an active plan. Prepaid numbers may be deactivated if you stop topping up or using the line for a long time; the rules vary by carrier. In the US and Canada a SIM is usually tied to the country it was bought in, and UK pay-as-you-go SIMs work the same way.
Buying a SIM in another country, for example a UK number when you live in the US, is usually impractical without traveling there.
When a temporary number makes more sense
If you only need to get past a verification step once, such as a trial, a one-off purchase, or an app you are testing, a temporary number is faster and avoids an ongoing plan. With Noir SMS you pick the service and country, the code appears in the dashboard, and if no SMS arrives within 20 minutes the charge is refunded.
If you later decide to keep that account, add your own number, email or an authenticator app. And as always, use it only for your own legitimate accounts.
Verdict
Pick a prepaid SIM if the account matters to you long term: your main messaging app, your primary email, or anything you need to recover later. It costs more effort but gives you a number you control. Pick a temporary virtual number when you need one code quickly, need a number from another country, or do not want to manage a second plan. Many people use both: a prepaid SIM as a durable second line, and temporary numbers for one-off sign-ups.
Frequently asked questions
Do I need ID to buy a prepaid SIM?
It depends on the country and carrier. In the US, UK and Canada, prepaid SIMs can often be bought without showing ID, but rules and store practices vary and can change. Check with the carrier.
Will a prepaid SIM work for WhatsApp long term?
Yes, as long as the number stays active. That is the main advantage over a temporary number, which cannot receive a re-verification code later.
Can a prepaid number expire?
Yes. Carriers may deactivate a prepaid number after a period with no top-up or usage. The period varies, so check your carrier's terms.
Is a temporary virtual number a SIM card?
No. You never hold a SIM. Noir SMS rents you a mobile number from a carrier and shows incoming SMS in a web dashboard.
Can I get a UK number without living in the UK?
For a single verification, yes: Noir SMS offers UK (+44) numbers in the dashboard, subject to stock. For a UK number you keep, you would generally need a UK SIM or eSIM.
Services mentioned
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