すべての比較比較

Google Voice Alternative 2026: Works Outside the US

Google Voice gives you a free US number and free domestic calls. TwinPhone gives you cheap international calls from anywhere in the world. They solve different problems, so which one fits depends on where you live and whom you call.

著者· TwinPhone 創業者・代表者公開 更新

結論

以下の9項目で比較しています。要点を並べて示します。

TwinPhone

  • Sign-up — Email, no US number needed
  • Free domestic calls — No
  • International rates — US & Canada $0.02/min; others shown before you dial
  • Virtual numbers — US & Canada ($3.19+)
  • Encryption — TLS + SRTP in transit

Google Voice

  • Sign-up — US phone number required
  • Free domestic calls — US/Canada free
  • International rates — Per country, on Google's rates page
  • Virtual numbers — US only (free)
  • Encryption — Google infrastructure
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A laptop placing an international call straight from the browser

項目別の比較

機能ごとの比較
項目TwinPhoneおすすめGoogle Voice
Sign-upEmail, no US number neededUS phone number required
Free domestic callsNoUS/Canada free
International ratesUS & Canada $0.02/min; others shown before you dialPer country, on Google's rates page
Virtual numbersUS & Canada ($3.19+)US only (free)
EncryptionTLS + SRTP in transitGoogle infrastructure
Call recordingBusiness plans onlyBasic
Team featuresShared wallets + analyticsGoogle Workspace only
Transparent per-minute pricingYes (rate shown before each call)Per minute (rounded up)
App requiredNo (browser)No (web or app)

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Where Google Voice Wins

Let's be fair: for US and Canada domestic calls, Google Voice is unbeatable — it's free. If you live in the US and primarily call US numbers, Google Voice does the job at zero cost.

Google Voice also integrates seamlessly with Gmail, Google Calendar, and the rest of the Google ecosystem. If your life runs on Google products, the integration is genuinely useful.

Where TwinPhone Fits Better

For calling from outside the US, TwinPhone fits better on these points:

Sign-up — TwinPhone needs no US number: you sign up with an email. Google Voice requires a US phone number to sign up, and personal Google Voice accounts are available only in the US (Google Voice Help, checked 11 Oct 2026).

Rates — TwinPhone charges $0.02/min to the US and Canada and shows the exact rate for any other number before the call connects. Compare it with Google Voice's published rate for the same country and line type.

Security — TwinPhone encrypts call signalling with TLS and call audio with SRTP in transit.

Virtual numbers — TwinPhone rents US and Canadian numbers to people outside North America. It does not sell numbers in other countries. Google Voice only provides US numbers.

Billing — TwinPhone bills per minute, rounded up, with the exact rate shown before every call and no connection fee.

Can You Use Both?

Absolutely. Many users keep Google Voice for free US calls and use TwinPhone for international calls. The two services complement each other well.

Google Voice handles your free US number and domestic calls. TwinPhone handles calls abroad from a browser, with the per-minute rate shown before each call, and rents US or Canadian numbers to people outside the US.

従量課金

145か国以上へ発信、料金は分単位

登録は無料。開始にカードは不要です。$10をチャージして、実際に通話した分だけお支払い。月額料金やサブスクリプションはありません。

登録にカード不要 · $10チャージ · 通話したときだけ支払い

よくある質問

TwinPhone vs Google Voiceについてよくある質問。

You need a US phone number to create an account. Once set up, you can make outbound calls from abroad but may experience limitations. TwinPhone needs no US number: you sign up with an email.

It varies by country and by landline versus mobile. TwinPhone charges $0.02/min to the US and Canada and shows the exact rate for any other number before you dial; check Google Voice's rates page for the same destination.

TwinPhone encrypts call signalling with TLS and call audio with SRTP in transit. Google Voice runs on Google's own infrastructure and documents its security separately; we do not rank one above the other.

TwinPhone browser calling interface

乗り換えますか?

従量課金。米国・カナダは$0.02/分、その他は発信前に料金を表示。ブラウザだけで、アプリもSIMも不要。

登録は無料。カード不要・月額料金なし。チャージは利用が30%以下なら14日以内に返金可能

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