When you're getting ready to study abroad, it's natural to wonder, "Do I actually need a phone number over there?" or "What should I do about my current number back home?" The truth is that the connectivity you'll need varies from person to person. Someone who just needs a reliable internet connection will make a very different choice from someone who absolutely needs a working phone number. In this guide, we'll break down three options — a data-only eSIM, a calling app (VoIP), and a local SIM — and show you how to mix and match them based on what you actually do. Whether it's your first time abroad or not, we'll cover the things to watch out for, how to choose, and answers to common questions.
The Short Answer
Let's start with the conclusion. For connectivity while studying abroad, the basic idea is to combine options to fit your goals.
- If your daily life revolves around the internet, a data-only eSIM is often all you need.
- If you want to keep your existing phone number from back home, pairing a number-hold (suspension) service with a calling app (VoIP) can be convenient.
- Opening a local bank account or signing various contracts may require a local phone number.
- VoIP numbers (app-based phone numbers) sometimes can't be used for SMS verification with banks and certain services.
In other words, your choice depends on which describes you: "just the internet," "I also want to keep my home number," or "I need to sign up for things locally." Let's look at each one in turn.
"Phone Number" and "Data" Are Two Different Things
The first thing worth clarifying is that your phone's connectivity has two distinct roles. One is "data (the internet)," used for maps, search, social media, app-based calls, and so on. The other is your "phone number," used for traditional calls and SMS (text messages).
What actually takes up most of your time abroad is data. Messaging and calls through apps like WhatsApp, Google Maps, looking things up, video, online classes — all of these work as long as you have an internet connection. On the other hand, calls placed to and from a traditional phone number, and SMS sent to a number, run on a separate system from data. Once you separate these two in your mind, it becomes much easier to see what you personally need.
Quick Comparison: How to Use Each Option
| Option | Best for | Things to note |
|---|---|---|
| Data-only eSIM | Internet, maps, app calls, social media | No phone number or SMS included |
| Calling app (VoIP) | Calls via a number, some SMS, keeping your home number | May not work for some verification (e.g. banks) |
| Local SIM | Local contracts, identity verification, a local number | Often requires sign-up and ID verification |
These three aren't "pick only one." You can combine them — for example, "data through an eSIM, home number kept alive via VoIP," or "an eSIM most of the time, and a local SIM only when I need to sign up for something locally."
1. Data-Only eSIM — The Default If You're Internet-Focused
A data-only eSIM lets you get online without swapping a physical SIM card — you just set it up by scanning a QR code or similar. The big appeal is convenience: get everything set up before you leave, and you can be online the moment you arrive.
Navigating with maps, staying in touch with family and friends over WhatsApp, joining online classes — much of study-abroad life can run on data alone. If you don't plan to use a phone number or SMS and just need the internet, a data-only eSIM is a simple, easy-to-understand choice.
One thing to keep in mind: a data-only eSIM generally doesn't include a phone number or SMS. If you need to make and receive calls, or to receive SMS verification codes sent to a number, consider pairing it with VoIP, a local SIM, or your home SIM as described below.
2. Calling App (VoIP) — When You Want to Keep Your Home Number
VoIP refers to apps that handle calls and SMS over an internet connection. If you don't want to cancel your existing phone number while you're abroad, or you want to keep using it after you go back, pairing it with your carrier's number-hold (suspension) service can let you keep the number while still making and receiving some calls overseas.
That said, VoIP has a limitation worth knowing about. With banks and some important services, SMS verification codes (identity-confirmation codes) sent to a VoIP number may not arrive or may not be accepted. For steps you really can't afford to fail — like logging in to a credit card or bank account — it's reassuring to keep a physical SIM from home or another method on hand.
3. Local SIM — For Local Contracts and ID Verification
If your stay is long-term and you'll be opening a local bank account or signing up for housing or a phone plan, you may need a local phone number. For these "local identity verification and contracts" situations, a local SIM (or a local carrier's eSIM) comes in handy.
On the other hand, a local SIM often requires a sign-up process and ID verification (such as showing your passport), so it isn't always usable the moment you land. That's why people who want connectivity from day one often take a two-step approach: secure data first with a data-only eSIM, then sign up for a local SIM once they've settled in. It saves a lot of last-minute scrambling.
Which Type Are You? — A Guide to Choosing
You can sort out what you need by thinking about it like this.
- Short stay / the internet is really all I need → A data-only eSIM is the default.
- I also want to keep my home number (I'll use it again later) → Data-only eSIM + number-hold + VoIP.
- Long stay where I'll need local banking and contracts → Data-only eSIM + local SIM (local number).
- I need to reliably receive important SMS verification → Keep your home SIM, or use a local SIM's number.
There's no single "right answer" — it changes based on how long you'll stay, what you'll do locally, and what you want to do with your home number. If you're unsure, the rule of thumb "secure data first, then add a number option as needed" makes it hard to go wrong.
Worth Doing Before You Travel
- Check whether your device supports eSIM and whether it's carrier-unlocked.
- Set up your data-only eSIM before departure, and confirm the guidance on when to activate it once you arrive.
- If you're keeping your home number, look into your carrier's number-hold (suspension) process before you leave.
- Organize the contact methods for important verification (banks, cards) so you can still receive them while abroad.
Just confirming these before you go can dramatically cut down on stressful moments like "I have no internet" or "my verification code isn't coming through" after you arrive.
A Few Honest Notes
- Bloomy eSIM is a data-only eSIM. It generally does not include a phone number, SMS, or voice calls. (App-based calls that run over data, such as WhatsApp, may be usable wherever you have a working internet connection.)
- A calling app (VoIP) may not work for SMS verification with banks and some services. For important verification, please also have your home SIM or another method ready.
- Connection quality and service specifications can vary and change depending on local network conditions, your coverage area, your device, and the provider. A fair use policy applies, and plan details are subject to change — please check the latest information shown before you buy. Prices are shown in USD; confirm the current price at the time of purchase.
What You Can Do with Bloomy eSIM
If you find yourself stuck on "which plan should I actually pick?", it helps to be able to search by destination, data allowance, and number of days. On Bloomy eSIM's comparison page, you can compare data-only eSIM plans by country, data amount, and length of use. Including whether or not you need a phone number and SMS, the smoothest approach is to first sort out "am I internet-focused, or do I also need a number?" and then choose.
Related Links
- Can You Use a Phone Number with Just an eSIM? Calls, SMS, and Verification Explained
- When Do You Need a Local Carrier's Phone Number?
- Pre-Departure Checklist: Preparing Your Data (eSIM) and Phone Number
- eSIM Comparison Page
Summary
The connectivity you need abroad depends on whether you prioritize the internet, a number, or local contracts. Internet-focused? A data-only eSIM. Want to keep your home number? VoIP. Need to sign up for things locally? A local SIM. The trick is to match the option to the job. Secure your data first, then add a number option as needed, and even a first study-abroad trip becomes far less stressful to prepare for. If you'd like to understand a bit more of the basics, take a look at Can You Use a Phone Number with Just an eSIM? Calls, SMS, and Verification Explained as well.
