Call any Vietnamese phone. Landlines and mobiles. No app, smartphone, or internet on their end.

Calling Vietnam, answered.

• How much does it cost to call Vietnam with Kalum? +

  From 22¢ per minute to any Vietnamese number, as of September 11, 2026. Mobile and landline numbers there can price differently, so the app shows the exact rate for the number you type before you dial — that is the rate you are charged. Calls are billed per minute, rounded up, with a one-minute minimum.

• Does the person in Vietnam need the app or internet? +

  No. Kalum routes through real phone networks, so their phone rings like any normal call. They need no app, no smartphone, and no internet — an old landline or feature phone works.

• Can I call landlines in Vietnam? +

  Yes. Kalum reaches landlines and mobiles in Vietnam alike, and whoever you call answers on whatever phone they already have. Per-minute rates can differ between the two, so the app shows the exact rate for the number you type before the call starts.

• How do I call Vietnam? +

  Download Kalum on iPhone or Android, sign up with your phone number, and add credit starting from $4.99. Pick Vietnam (+84) in the dialer, type the local number, and hit call.

• Can I call Vietnam from my cell phone? +

  Yes. Kalum runs on your own iPhone or Android, so you call Vietnam straight from your cell phone over Wi-Fi or mobile data. The person you reach picks up on whatever phone they already have — no app or internet needed on their end.

• What is the number format for calling Vietnam? +

  Vietnamese mobiles are 9 digits starting with 3, 5, 7, 8, or 9 (written locally with a leading 0). Drop the leading 0 and dial +84, then the rest of the number. In the Kalum dialer you just pick Vietnam (+84) and type the local number — the country code is set for you.