How to Call Local Numbers with Data Only eSIM

Data-only eSIMs offer internet access but no voice calls. So how do you call a hotel or taxi without voice service? Use Viber Out — here’s a simple way to do it

What Is the Essence of the Problem

After purchasing an eSIM with the Internet, the user gets access to all applications, sites, messengers — everything works. But when you need to call a local number, for example, a hotel or a doctor, regular calls do not go through.

Why? Because this is not a full-fledged SIM card, but only the Internet - without voice communication (without VoLTE, without SMS).

Solution: TooSim +Viber = Calls Anywhere

Many people forget that Viber has a feature called Viber Out — a way to call regular numbers using only the Internet. It works in almost any country.

Here's what the whole process looks like — from installing an eSIM to making a call.

Instructions: How to Make Calls with Data-Only eSIM

Step 1. Buy eSIM

First, you need to buy an eSIM with Internet. This can be done in advance on the TooSim website — select the country, pay for the order, and a QR code is sent to your email.

Installation takes 3-5 minutes.

Step 2. Activate eSIM on Your Phone

Depending on the device:

After activation, the Internet works immediately — you can check by opening a browser or any application.

Activate eSIM on iPhone

Step 3. Install Viber

You can download Viber via Google Play or App Store. Installation is standard:

  1. 1. Find in the app store.
  2. 2. Download and install.
  3. 3. Register (usually by phone number).

Download Viber

Step 4. Set Up Viber Out

Once Viber is installed, you need to activate the function for calls:

  1. 1. Open the application.
  2. 2. Go to the "More" section.
  3. 3. Find the Viber Out item.
  4. 4. Top up your account:
  • - via World Credits (universal credits for any country);
  • - or select a specific plan for the desired country in the Plans section.

Prices are affordable — for 5 euros you can get enough minutes for several local calls.

Viber Out with data only eSIM

Step 5. Make a Call

After replenishing your balance:

  1. 1. Go to the "Calls" menu.
  2. 2. Select the desired contact or dial the number.
  3. 3. Click "Viber Out Call".

The call will be made via the Internet, but to a regular mobile or landline number.

Faq

Why don’t voice calls work with my eSIM

Data-only eSIMs are designed specifically for internet access — they don’t support traditional voice calls or SMS. This is intentional and not an error. To make calls, you’ll need to use internet-based apps like Viber, WhatsApp, or FaceTime Audio.

Can I use VoIP apps everywhere when traveling ?

In some countries, VoIP is blocked (for example, in the UAE, Qatar, and partly in Turkey)

Which VoIP apps are best for making calls ?

We only recommend reliable and trusted VoIP services:

  • Viber Out
  • Google Voice (US only)
  • Microsoft Teams