Comparison · Temporary mobile number vs Second SIM or eSIM

The best number for a second account

Many people keep a second account for work, a side project or privacy. Apps tie accounts to numbers, so the choice of number decides how easy the account is to keep. This page compares the two most common choices and mentions the alternatives. It's for people running their own extra accounts, not for creating accounts in bulk.

Quick answer

For a second account you'll keep for years, a second SIM or eSIM line is safest because you can re-verify any time. For a second account you need quickly, or one that's secondary, a temporary mobile number from Noir SMS verifies it in minutes for one payment; then add an email and authenticator because the number is recycled later. Calling-app VoIP numbers are cheap but often rejected by WhatsApp, Telegram and others.

Side by side

Temporary mobile numberSecond SIM or eSIM

Time to set upMinutes, in a browserBuy a SIM or activate an eSIM

Cost modelPay once per numberMonthly plan or prepaid credit

Re-verify laterNo, the number is recycledYes

CallsNo, SMS onlyYes

Keeps your personal number privateYesYes

Best forSecondary or short-term accountsAccounts you'll keep for years

Built-in second-account options first

Instagram supports several accounts in one app, and Telegram supports up to three accounts per app. WhatsApp offers a second account in the same app on Android and also has WhatsApp Business. Each of those still needs its own number when the app asks for one.

What about calling apps?

VoIP numbers from calling apps are cheap and can last, but WhatsApp, Telegram and many others often reject them or never deliver the code. Mobile numbers, including Noir SMS numbers, are accepted more often.

Protect the second account

Add an email and an authenticator app right after verifying.
Set a WhatsApp two-step PIN or a Telegram password.
Don't link accounts you want to keep separate in Accounts Center or contact sync.

Verdict

Use a second SIM or eSIM for any second account you couldn't afford to lose. Use a temporary Noir SMS number for a secondary account, a quick setup or when you don't want a monthly plan, and add recovery options right away. Avoid VoIP numbers for messaging apps.

Frequently asked questions

Can I make a second WhatsApp with the same number?

No. Each WhatsApp account needs its own number.

Is having two accounts allowed?

On most apps, yes, as long as you follow their rules. Creating accounts in bulk isn't.

Services mentioned

WhatsAppfrom $0.82Instagramfrom $0.15Telegramfrom $0.54

Related guides

App guides

Two WhatsApp Accounts on One Phone: Methods and How to Get a Second Number

Run two WhatsApp accounts on one phone with built-in multi-account, WhatsApp Business or dual apps, and learn where to get the second number you need.

Read the guide →App guides