AI phone agents in Korean

ThunderPhone supports Korean across the full customer experience: agents can speak and understand Korean on calls, the dashboard ships with a Korean interface, and the docs site has a dedicated Korean documentation edition.

Korean is one of ThunderPhone's 47 supported voice languages. It is an included language, so selecting Korean does not add a language surcharge to the Spark, Bolt, or Storm engine rate.

Korean voice availability and pricing

The current catalog includes eight compatible voices for Korean, including two premium Korean voices, Jiwoo and Taehyun. The premium voices add 3¢ per minute; the other compatible voices use the included Korean language path with no language charge on top of the engine rate.

Engine pricing is pay as you go with no subscription: Spark at 2¢ per minute, Bolt at 5¢ per minute, and Storm at 9¢ per minute, before telephony and other optional charges. The voice picker filters the catalog to voices that support every language selected for the agent, and each voice can be previewed in the builder before deployment.

Evaluate voice quality against the calls you actually expect. Test Korean names, addresses, phone numbers, honorific register, English loanwords, and any product or brand terms your callers use.

Korean in the dashboard and documentation

Korean is a shipped dashboard locale, not just a call setting. A team can work in the Korean interface while writing prompts, reviewing transcripts, and managing the organization.

ThunderPhone publishes a dedicated Korean documentation edition on its docs site, so Korean-speaking builders get localized product guidance alongside the Korean-speaking agent experience.

Korean and English in one call

An agent has one primary language and can have additional languages. If Korean is primary and English is additional—or the reverse—the agent switches automatically when the caller changes language mid-call.

The chosen voice must support every selected language. Korean conversations often mix in English product names, email addresses, and technical terms, so test realistic switching patterns rather than assuming every code-mixed phrase behaves the same way.

Sample Korean call experience

The following flow is written in English to describe what happens, not to prescribe exact translated wording.

Agent starts in Korean: Greets the caller politely, identifies the business, and asks how it can help.

Caller answers in Korean: Says they want to reschedule tomorrow's appointment.

Agent continues in Korean: Confirms the caller's name, checks the approved scheduling action, and offers two available times.

Caller switches to English: “Actually, can you send the confirmation to my work email?”

Agent switches to English: Reads the email address back and confirms where the notice will be sent.

Caller returns to Korean: Confirms the new appointment time.

Agent returns to Korean: Repeats the final date and time, then closes the call according to the business's instructions.

The switch happens within one call; the caller never navigates a phone tree or dials a separate number.

Build and test a Korean agent

1. Set Korean as the primary language, or add it as an additional language on an existing agent.
2. Choose one of the eight compatible voices that supports the complete selected language set.
3. Write the operating prompt in the language your team can review most reliably; the agent's spoken language is configured separately.
4. Attach only approved knowledge sources and integrations.
5. Run browser tests and simulations with Korean-only, English-only, and mixed-language scenarios.
6. Review transcripts, pronunciation, honorific register, tool actions, and escalation behavior before deployment.

Frequently asked questions

Does ThunderPhone support Korean voice calls?

Yes. Korean is one of ThunderPhone's 47 supported voice languages and currently has eight compatible voices in the catalog.

Does Korean cost extra as a language?

No. Korean is an included language, so it adds no language surcharge to the Spark (2¢), Bolt (5¢), or Storm (9¢) per-minute engine rate. Pricing is pay as you go with no subscription.

Are premium Korean voices available?

Yes. The catalog currently lists two premium Korean voices, Jiwoo and Taehyun, at an additional 3¢ per minute.

Is the ThunderPhone dashboard available in Korean?

Yes. Korean is a shipped dashboard locale, so builders can operate the entire product interface in Korean.

Are ThunderPhone docs available in Korean?

Yes. ThunderPhone publishes a dedicated Korean documentation edition on its docs site.

Can a Korean agent switch to English during a call?

Yes. Add English as an additional language and choose a voice that supports both. The agent switches automatically when the caller changes language mid-call.