Privacy
How a second phone number protects your privacy
Your mobile number links your accounts, your identity and your location. A second number for everything public keeps the real one out of data breaches, spam lists and strangers' hands.
Think about where your mobile number lives today: in the customer databases of every shop you ever ordered from, in the contact lists of everyone who saved it, in the sign-up records of apps you no longer use, and in a few places you would rather it did not. Unlike a password, you cannot rotate it when something leaks. A number stays yours for years, so anything attached to it accumulates.
That is the case for a second number. It is not about hiding; it is about deciding who gets the number that matters.
Why a phone number is worth protecting
It is a login. Many services use your number as the account identifier and send codes to it. Anyone who knows your number knows where the codes go.
It links things together. A number appearing in two databases connects them. Data brokers and people-search sites build profiles this way: a number from a marketplace listing, a name from a leaked account, an address from a delivery.
It is a way in. Most unwanted calls and texts start with a number harvested from somewhere ordinary: a raffle entry, a listing, a loyalty scheme.
Where a second number earns its keep
Give the second number, not your real one, to:
- Online marketplaces, classified ads and anyone buying or selling from you.
- Dating apps, until you know someone.
- Deliveries, couriers, tradespeople and one-off services.
- Loyalty cards, competitions, event registrations and newsletters.
- Any form that demands a phone number for no clear reason.
Calls and texts to that number still reach you, in the app, so you lose nothing. But if the number ends up on a list, the list has the wrong number.
Keep the separation clean
A second number only protects you if the two lives stay apart.
Keep private contacts in the app. Second Phone has its own contacts list, separate from your phone's address book, so the people you meet through the second number never mix with your real contacts. See Create a private Second Phone contact.
Lock the app. A PIN or biometric lock means someone with your unlocked phone still cannot open your second numbers and messages.
Let voicemail screen for you. With voicemail on and business hours set, unknown callers outside your chosen times leave a message instead of getting through.
Retire numbers. When a sale is finished or a conversation is over, deactivate the number or let it expire and take another. Your real number never has to change.
What a second number does not do
It does not make you anonymous. You sign up for it with an identity, and misuse of a number is still misuse. It does not stop a service you actively use from knowing you. What it does is stop your one permanent number from being the thread that ties everything together.
Frequently asked questions
Will people see my real number if I call from the second one?
No. Calls and texts made from a second number show that number. Your personal mobile number is not involved and is not shown.
Can I have several second numbers for different purposes?
Yes. Second Phone allows up to ten numbers on one account, so you can keep one for selling, one for work and one for sign-ups, each with its own conversations and call history.
Is a second number the same as a burner?
A burner is thrown away after one use. A second number can be that, since extra numbers can be bought for as little as seven days, but most people keep one for months or years as a permanent public-facing number, and only retire it when they choose.