How to Make Phone Calls With a Data-Only eSIM

Updated 2025 — Many travel eSIMs, including plans from Roamjet, offer data only. But that doesn’t mean you can’t make phone calls. This guide explains the best ways to stay reachable using VoIP apps, Wi-Fi calling, virtual numbers, and more.

Why Data-Only eSIMs Don’t Include Regular Calling

Most travel eSIM plans are designed to provide affordable mobile data anywhere in the world. They do not include a dedicated phone number from the local operator, which means your phone’s native dialer often cannot make traditional GSM voice calls.

Instead, calls must go through the internet — which is easy once you know which method to use.

Best Ways to Make Phone Calls With a Data-Only eSIM

1. VoIP Apps (WhatsApp, FaceTime, Telegram, Skype)

The fastest and simplest method. These apps place calls using your mobile data. If your contact uses the same app, calls are free and encrypted.

2. Wi-Fi Calling (If Your Carrier Supports It)

If your original SIM supports Wi-Fi Calling, your normal phone number can work over your Roamjet eSIM data connection. Enable it before travel, as some carriers block activation abroad.

3. Virtual Phone Number Services

Platforms like Google Voice, TextNow, and Hushed provide a real phone number that works entirely online. Ideal if you need SMS verification or a business contact number while travelling.

4. SIP Softphone Apps (Advanced)

Apps like Zoiper or Linphone connect to a SIP VoIP provider. This is popular for business users needing cheap international calling or PBX integration.

Recommended Setup for Travellers

• Install your Roamjet eSIM before departure.
• Activate WhatsApp, FaceTime, or another VoIP app your contacts use.
• Keep your physical SIM inside the phone if you rely on SMS authentication.
• Enable and test Wi-Fi Calling before leaving your home country.
• Make a quick test call once your eSIM activates abroad.

Common Questions

Can I still receive calls to my regular number?

Yes — if you keep your original SIM active or if Wi-Fi Calling works on your device.

Can I make emergency calls?

Not guaranteed. Emergency calling depends on the phone, region, and network. Always have a backup method in critical situations.

Does calling use a lot of data?

Voice calls typically use 0.5–1 MB per minute — extremely small compared to video streaming.

Why Use Roamjet?

• Instant delivery of global eSIMs
• No physical SIM card required
• Works in 190+ countries
• Perfect for VoIP and travel calling solutions

Bottom line: With the right setup, calling over a data-only eSIM is simple, reliable, and often cheaper than roaming. Install Roamjet, enable your preferred calling method, and you’re ready to go.