Your phone number is not a small thing to hand over. It is a bridge. Type it into Truecaller’s reverse lookup and it can return a name, a location, and a service provider, built from other people’s uploaded address books, not from anything you agreed to. Your number can show up in that directory even if you never installed Truecaller yourself. Sync.me runs a similar contact-matching database. Hand your real number to a match, and you’ve handed them the first link in a chain that ends at your full name, then your city, then your address and relatives, through free people-search sites.
So you need a second number. The part most guides skip: not all second numbers are equal, and the cheap, obvious option carries a specific cost on the other side of the conversation.
What each option actually resolves to
Google Voice. Free. A public reverse lookup on a Google Voice number shows only that it belongs to Google Voice, not a name. That sounds like real protection, and for casual snooping it is. But it isn’t anonymous: under subpoena, Google can disclose the account holder, the linked forwarding number, IP addresses, and logs. The number you forward it to is the real bridge, because that’s a carrier subscriber record with your name on it. Free, easy, and the weakest option against anyone with legal process behind them.
TextNow, Hushed, Burner. VoIP apps, created with just an email address. Hushed runs from $6.99 a month for unlimited use; Burner is $3.99 a month billed annually or $7.99 month to month (2026 pricing). Same category of number as Google Voice: easy, cheap, and it dissolves the same way under legal process.
Prepaid SIM or eSIM. A physical or virtual line, provisioned to a device with its own permanent hardware ID (the IMEI), on a real carrier. Mint Mobile sells eSIM plans built for exactly this kind of compartmentalized setup. This is not anonymity: your carrier still knows which device the line runs on, keeps tower location data, and your payment method creates its own trail. What it buys is separation, an identity that platforms and banks accept as a normal number instead of flagging it. That flag is real: many banks, dating apps, and delivery apps reject or silently drop verification codes sent to VoIP numbers.
The practical answer is both, for different jobs. A prepaid eSIM for banks, delivery services, and any platform doing phone verification, since it passes as a normal carrier line. A VoIP number (Google Voice, Hushed, or Burner) for the person you’re actually arranging with, since you can kill and replace it in minutes if something goes wrong. Never put your real carrier number, the one billed to your legal name, into an arrangement site or hand it to a match directly.
The mistakes that undo all of it
A setup like this almost never fails because the technology failed. It fails because of a habit. In documented patterns of how anonymous online identities get unmasked, the leading causes are, in order: linking the alt identity to a personal Facebook or other social account (about a quarter of cases), accidentally leaving contact syncing on (also about a quarter), using the same device for both identities (about a fifth), and reusing a real phone number or email (about one in six).
Concretely, for a second number:
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Don’t sync contacts. If your second number’s app, or the phone it lives on, uploads your address book, it links to every person who has your real number saved, and to directories like Truecaller’s that are built from exactly that kind of upload. Turn off contact sync, and check again after every app update, since updates have a habit of quietly re-enabling it.
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Don’t use it for deliveries to your real address. A delivery under a different name to your actual home links the two the moment anyone cross-references the address, which people-search sites make trivial. Keep the address, payment method, and number consistent within one identity, never split.
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Don’t run both identities off the same device carelessly. Same-device use, logging into both from the same phone on the same home or work Wi-Fi, shows up repeatedly in how people got unmasked. A separate device is the clean fix.
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Don’t reuse a username across the two identities. A shared handle is a search-engine bridge that undoes a clean number and email setup instantly.
Pair it with a separate email
The same rule applies to email as to the phone: a fresh account with a dedicated provider, created from the dedicated device, never used for anything in your real life, and never just an alias forwarding to your main inbox. An alias is convenient, but if the forwarding relationship is ever exposed, it points straight back to you. Apple’s Hide My Email is genuinely useful for throwaway signups, but it isn’t the arrangement email: use a standalone account, and treat it the way you treat the number, one purpose, no crossover.
The honest tradeoff: a VoIP number reads as a caution flag
Here’s the part that cuts both ways. Anyone doing basic diligence on you, and a careful person on the other side should be, can run a free carrier lookup and see your number is non-fixed VoIP: created online in minutes, no identity check behind it, the same category used heavily for spam and scam accounts. That doesn’t mean you’re lying. Privacy-conscious people on both sides of arrangements use Google Voice and Burner numbers routinely and sensibly. But it’s a legitimate “verify harder” signal, not a verdict, and a careful match is right to treat it that way.
The offset is the same tool that defeats most fraud on either side of this anyway: a short, unannounced live video call, before money or meeting plans. It costs you nothing you weren’t already doing for safety, and it converts “anonymous VoIP number” into “a real person I’ve seen and talked to,” which the number itself couldn’t prove either way.
Get the number and email set up before your first real conversation, not after something goes wrong. The free checklist on this page walks through the setup in order.
Sources: getcallro.com on Truecaller’s directory model; Bellingcat’s OSINT toolkit entry on Truecaller reverse lookup; Sync.me opt-out page; CLRN on Google Voice traceability and subpoena disclosure; Google Voice support page; Hushed and Burner 2026 pricing pages; Mint Mobile eSIM plans; unstar.app’s 2026 comparison of second-number apps; pseudoface.com’s analysis of identity-leak causes among anonymous online creators; Apple’s iCloud+ Hide My Email documentation. General education, not legal advice.