Google Voice is free in the U.S. TwinNumber is a mobile line.
Both give you a U.S. number you can use away from your SIM. The difference is the line type, who can sign up, and how you keep the number.
Side by side
| At a glance | TwinNumber | Google Voice |
|---|---|---|
| Line type | Mobile | VoIP |
| Price | $30 per 3 months or $100 a year, per number | Basic plan $0/month; paid plans from $10/month |
| Who can get one | Usable from 150+ countries; no U.S. SIM needed | Personal plans offered in the U.S.; Basic needs an existing mobile number |
| Where you use it | Any web browser | Web and mobile apps; desk phones on paid plans |
| Texting | Receiving is free; sending from $0.02; $1 a month included | Unlimited U.S. calls and texts on Basic |
| Keeping the number | Yours while your plan is active; held 30 days if a renewal fails | Google may reclaim it if unused for calls or texts for 3 months |
Facts about Google Voice come from its own website, checked on Oct 22, 2026. Prices and rules change; check theirs before you decide.
What actually differs
The three differences between TwinNumber and Google Voice that matter most for verification codes.
Mobile, not VoIP
Google Voice is an internet-based (VoIP) service, and many banks and payment apps turn VoIP away when they look up the line type. A TwinNumber is registered as mobile.
Open outside the U.S.
Google lists its personal plans as available in the U.S., and Basic needs a mobile number you already have. TwinNumber works from 150+ countries without a U.S. SIM.
No use-it-or-lose-it rule
Google may take back a number that goes 3 months without being used for calls or texts. A TwinNumber stays yours while your plan is active, however often you use it.
When Google Voice is the better choice
If you live in the U.S., already have a U.S. mobile number and want a free second number for calls and texts, Google Voice's Basic plan costs nothing. It's a good pick when the services you use accept it.
Questions
Is a Google Voice number a mobile number?
No. Google Voice works over the internet, and line-type lookups generally report its numbers as VoIP. A TwinNumber is registered as mobile.
Can I get Google Voice if I live outside the U.S.?
Google lists its personal plans as available in the U.S., and the free Basic plan needs an existing mobile number. TwinNumber works from 150+ countries, and you don't need a U.S. SIM.
Why pay if Google Voice is free?
If Google Voice works for the services you use, keep it. TwinNumber is for when you need a mobile line type, for example when a bank rejects VoIP, or when you can't get Google Voice where you live.
Will every service accept a TwinNumber?
Each service sets its own rules. A mobile line type passes the line-type check that turns VoIP numbers away, but it doesn't guarantee approval.
Other comparisons
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