Yolla review: International call pricing, US$3 call credit and usage restrictions

Yolla is a calling application that uses an internet connection to call overseas mobile and landline numbers. It is not a standard local monthly mobile network plan; calling requires Wi-Fi or mobile data, and your internet provider charges for mobile data according to your plan.

It suits people who call conventional overseas numbers occasionally or regularly. If the other person can also use a free internet messaging and calling application, first compare alternatives that both parties can use.

Yolla's rates vary by call destination and whether the number is a mobile or landline. Before topping up, enter the full number in the application to check the rate, and look for any connection fees, minimum charges or rounding rules; a single global rate cannot be used to estimate costs.

Hong Kong users should refer to the payment page for the actual currency charged and the in-app price. App store purchases and website top-ups may show different prices; check the amount payable and the balance before paying.

After you register using the Yolla invitation link on this page and code A7T8I9, the official Free Credits page states that new users receive US$3 in call credit after their first payment. Yolla's frequently asked questions state that only top-ups of US$4 or more count towards a referral. The credit is for Yolla calls only and cannot be redeemed for cash or transferred.

Open the invitation link directly from this page on your phone, and complete installation and registration using the same network connection. If the code is not applied automatically on the payment screen, enter it in the application's Get bonus／Bonus section. The referral programme may have limits or be withdrawn; keep your payment and registration confirmations.

Open the invitation link on your phone, install the application and register immediately. Yolla advises users not to switch between Wi-Fi and mobile data during registration, as referral tracking may otherwise fail. Users should also stay on the same phone and continue the same browsing process until registration is complete.

Before topping up, confirm that the invitation code is still shown in your account or on the payment screen. If the invitation does not appear, provide the invitation, registration and payment times when contacting Yolla customer support; the provider decides whether to issue a referral reward retrospectively.

US$3 is an in-app calling balance, not a bank deposit, cash or a transferable asset. After a paid top-up, first read the payment confirmation page and terms to understand cancellation, refunds, balance expiry and how customer support handles these matters. In-app purchases on different platforms may also be subject to the platforms' refund procedures.

Do not treat an unused balance as a cash reward already received; if you only need to make one or two short calls, calculate the top-up amount required using the destination rate to avoid leaving a balance you cannot use up.

Yolla is available in Hong Kong app stores. Store ratings change over time and reflect the overall application experience; they cannot establish the audio quality, connection success rate or customer service performance of an individual international calling route.

Before calling, use a small amount of credit to test destinations you call frequently, and make calls in a quiet setting with a stable internet connection. If call quality is inconsistent, check your network connection first, then contact official support.

Suitable for: People who need to call conventional overseas telephone numbers and can control costs at the rates shown by Yolla. The US$3 credit can be used for an initial trial, but your choice should be based on ongoing rates and your actual calling patterns.

Unsuitable for: People who mainly contact friends and family who also use free internet messaging and calling applications, need a local monthly SIM service, or are unwilling to pay for a top-up first.