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Google Voice is free, which makes it tempting for signups. It's also the single most commonly rejected number type. Here's why, and what to use instead.
Last updated: September 2026
Google Voice numbers are VoIP - they don't run on a physical SIM through a carrier network. Platforms that care about fraud and duplicate accounts (WhatsApp, PayPal, Tinder, Venmo, and most crypto exchanges) actively check for this and block VoIP numbers at signup, or accept the number but silently fail to deliver the SMS. Either way, you get stuck mid-signup with no number to fall back on.
It doesn't help that Google Voice numbers are reused - the same number can pass through many hands over the years, and platforms flag numbers with a long signup history as suspicious even when the underlying check for VoIP doesn't catch it.
| Criteria | zapsms | Google Voice |
|---|---|---|
| Line type | Real carrier, physical SIM | VoIP |
| Platform acceptance | Treated like any US mobile number | Often blocked or silently fails |
| Number history | Fresh, one customer per order | Can carry years of prior signups |
| Cost | From $0.50 per verification | Free, but unreliable for verification |
Read more on the underlying mechanics in VoIP vs non-VoIP numbers.
Some lower-security platforms don't check for VoIP at all, so Google Voice can work fine for those. The problem is you usually don't know which category a service falls into until the SMS fails to arrive. Using a non-VoIP number from the start avoids the guesswork - it works everywhere Google Voice does, plus everywhere it doesn't.
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