Last updated: June 25, 2026
The short answer: when an eSIM won't connect abroad, the cause is usually one of a few things — data roaming is switched off, the wrong line is selected for mobile data, an APN (connection) setting, a weak-signal location, or the timing of activation. Before you panic and delete the eSIM, try this order instead: toggle Airplane Mode on and off, turn on Data Roaming, then set your travel eSIM as the line used for mobile data. Working through it step by step makes it easy to narrow down. In most cases, reviewing your settings one at a time is enough to get back online. This guide walks through the steps and a checklist for both iPhone and Android, written so first-time users can follow along.
- The 5 main reasons it won't connect, and the order to check them
- The iPhone settings to verify
- The Android settings to verify
- A checklist to run before you delete anything
- How to prepare for when phone number and SMS aren't available
An eSIM is a SIM built into your phone, where your plan details are written to an internal chip — no card to swap in and out. Because there's no physical card to remove, whether you're connected often comes down to the state of your settings (which line is selected, whether roaming is allowed). The upside: most issues aren't a hardware fault — they're a setting, and you can usually fix them yourself by reviewing things in order. So rather than deleting the eSIM and reissuing it right away, the faster path is to calmly check your settings first.
Three things to check first
If you feel like you have no connection after arriving, take a breath and check these three before touching any advanced settings. In those anxious first moments after landing, these three alone often solve it.
- Turn Airplane Mode on, wait a few seconds, then turn it off (this makes your phone search for the network again).
- Move to a spot with better signal (deep inside airport buildings, underground areas, and moving vehicles can all have weak reception).
- Give it a little time (right after arrival, connecting to a local network can take a few minutes).
If that doesn't help, work through the settings below in order. For the overall setup flow, see our eSIM setup guide as well. With Bloomy, you add your plan with a single tap on the setup link you receive, so even if you need to set it up again, the steps stay simple.
Common causes and fixes (quick reference)
Connection problems tend to fall into a handful of patterns. Start with the table below to find the situation closest to yours. Once you have a sense of the cause, you can avoid randomly changing settings.
| Symptom / situation | Likely cause | What to try |
|---|---|---|
| You have signal bars, but data won't work | Data roaming is off | Turn on data roaming |
| No service / no carrier name shown | The eSIM isn't set as the active line, or signal is weak | Switch mobile data to the eSIM; change location |
| Connects, but is extremely slow | Signal/congestion, or speed management under the plan's terms | Change location or time; check usage and plan terms |
| Activated, but still can't use it | Activation timing, or before the start date | Check the plan's start conditions |
| SMS verification code doesn't arrive | The plan is data-only, so phone number and SMS may not be covered | Receive it another way (see below) |
iPhone: steps when it won't connect
On iPhone, you'll check things in order from the Settings app. These aren't options you touch often, so take them one at a time.
1. Turn on Data Roaming
Go to Settings → Cellular (Mobile Data) → select the relevant eSIM (cellular plan) → turn on Data Roaming. To use a local network abroad, Data Roaming needs to be on. It's easy to leave this off out of everyday habit, so it's the first thing worth checking.
2. Set the eSIM as your mobile data line
Go to Settings → Cellular → Cellular Data and confirm your travel eSIM is the one selected. If it's still set to your usual home SIM, you may not connect locally, or you could run up expensive roaming charges.
3. Turn the line on
Check that "Turn On This Line" is enabled for the relevant eSIM. If you have several lines installed, temporarily turning off the ones you don't need makes it easier to tell which line is actually carrying your data.
Android: steps when it won't connect
On Android, the menu names vary a little by model, but the flow is the same (the examples below follow Google Pixel devices). Your phone may use slightly different labels, so look for options that mean roughly the same thing.
1. Enable the eSIM (SIM)
Go to Settings → Network & internet → SIMs, select your travel eSIM, and turn on "Use SIM."
2. Turn on Roaming
In that same SIM's settings, turn on "Roaming." If this is off, you may show signal bars but still get no data.
3. Assign mobile data to the eSIM
Set your travel eSIM as the line used for Mobile data. If you're asked to enter an APN (access point), use the values provided for your plan. In most cases it connects automatically.
If you're unsure whether your model is supported, our compatible devices page can help. Confirming your device is supported before you travel saves a scramble once you arrive.
Still not connecting? A checklist
If the above doesn't fix it, check the following points in order. Deleting the eSIM means setting it up again, so make deletion your last resort.
- Is your device carrier-unlocked? (Phones bought from a local carrier are worth double-checking.)
- Have you passed the plan's start date and activation timing? (Check the details from when you purchased.)
- Is your destination within the plan's covered countries/regions?
- Have you tried restarting the device? (Especially helpful right after changing settings.)
- If your OS is old, consider an update (ideally done before you travel).
If none of this resolves it, our troubleshooting page covers fixes by situation. Take it one step at a time and you'll usually reach the cause.
When data works, but phone calls and SMS don't
Bloomy plans are generally data-only. This isn't a fault — it's by design. Data works, but making or receiving calls over a phone number (voice calls) and receiving verification codes by SMS (text message) may not be available.
The only things unavailable are voice calls over a phone number and SMS. App-based calls that use data — like WhatsApp, Messenger, and FaceTime — work as usual wherever you have a data connection. It's not that "all calls" are blocked.
If you rely on SMS verification for banking, bookings, or similar services, it's wise to prepare a backup — keep a way to receive SMS on a number you control, or use an authenticator app. It's worth sorting out how you'll handle numbers and SMS before you travel.
When an "unlimited" plan feels slow
Even with an unlimited-type plan, keep in mind that it doesn't mean unrestricted, high speed everywhere. After a certain amount of usage, speed management (a fair-use policy) may apply, and whether tethering is allowed can differ by plan. Connection speed also depends on the local network, the area, and congestion at different times of day.
In other words, "slow" doesn't automatically mean "broken." Try a different place or time, and check your plan's terms as well (terms can change, so confirm the latest details at the time of purchase). Our unlimited eSIM page explains how unlimited plans work. Taking a moment before you travel to decide whether unlimited or a set data amount suits how you use your phone makes the choice easier.
Sometimes asking us is faster than re-doing settings
If you've tried everything and nothing improves, the display looks clearly wrong, or you're not sure about your purchase or activation status — in cases like these, telling us what's happening can often be faster than setting things up over and over yourself. On the other hand, if you haven't yet checked data roaming or which line is selected, the quickest path is to work through this guide from the top. Sorting out which situation you're in before you act helps you avoid wasting time on the ground.
What you can do with Bloomy (where to check when stuck)
You can check the status of a purchased eSIM, your setup link, and your remaining data from My Account. If setup isn't going smoothly, start with the setup guide and troubleshooting, and if that still doesn't solve it, you can contact us. We've designed the flow so that, even as a first-timer, you can work through it calmly in order.
(The steps in this article are general as of June 2026. Screens and option names may differ depending on your device, OS, and plan.)
If you're still choosing a plan for your destination, our eSIM comparison page lets you search by country, data amount, and number of days.
