eSIM Not Showing 5G or Slow Data Abroad? Causes and Fixes

Slow data or no 5G on a travel eSIM is usually a setting, a plan limit or a crowded mast, not a broken eSIM. Work through the checks below in order and you will fix most cases in a few minutes.

Menu names change slightly between iOS and Android versions and between phone brands, so treat the paths here as a guide. The order matters: cheap, reversible checks come first, and anything that deletes or reinstalls the eSIM comes last.

Is data roaming switched on for the eSIM line?

This is the most common cause of "connected but nothing loads". Roaming is set per line, so your home SIM being fine tells you nothing about the travel eSIM.

1. On iPhone, open Settings, tap Cellular, then tap the travel eSIM line if you have two lines.
2. Tap Cellular Data Options and turn on Data Roaming.
3. Back on the Cellular screen, check that the travel eSIM is the line selected for Cellular Data.
4. On Pixel and most Android phones, go to Settings, Network and Internet, SIMs, pick the eSIM, and turn on Roaming. Wording varies by brand.

Your provider's install instructions may say whether roaming should be on. For most travel eSIMs the answer is yes, because the eSIM connects through a local partner network.

Should I choose the network manually or leave it on automatic?

Automatic is the right default, but it can latch onto a weak network. If the signal bars look fine and pages still crawl, try another partner network.

On iPhone, Apple's own roaming page does not cover manual selection, but the menu is Settings, Cellular, Network Selection, where you switch off Automatic and pick from the list. On Pixel, the manual option sits under the same SIMs menu and is labelled Network.

Pick one of the networks your eSIM provider lists as supported for that country. If the list shows an operator that is not on the provider's list, it may connect and still give you nothing, so go back to Automatic and try another. Switch back to Automatic when you move to a new city, because a network that was strong in one place can be poor in the next.

Why is my phone not showing 5G?

First, 5G is not guaranteed on any eSIM. It depends on three things at once: your phone, your eSIM plan and the network you land on. Apple states that you need an iPhone 12 or later, a carrier that supports 5G and a 5G-capable plan. Google says not every Pixel works on every operator's 5G network. Many travel eSIMs are sold as 4G/LTE only, and some plans include 5G only on certain partner networks. Check your plan's description before assuming something is wrong.

If your plan does include 5G, check the toggle:

1. On iPhone, go to Settings, Cellular, Cellular Data Options, Voice & Data (choose the eSIM line first on a dual-SIM setup).
2. 5G Auto switches to LTE when 5G would not noticeably help. 5G On uses 5G whenever it is available, at some cost to battery. LTE turns 5G off.
3. On Pixel, go to Settings, Network and Internet, SIMs, Preferred network type and choose the 5G option.
4. Turn off Low Power Mode on iPhone and Battery Saver on Pixel. Both can disable 5G.

A 5G icon only means 5G is available nearby, and Google notes that it does not prove you are connected to it. Stuck on 4G in a place with weak 5G is normal, and LTE is often fast enough for maps, messaging and video calls.

Could the APN be wrong?

If you have signal and roaming on but no data at all, check the APN (access point name). Most modern eSIMs set it automatically, so you rarely need to touch it.

On Pixel, it lives under Settings, Network and Internet, SIMs, Access point names. On iPhone, the APN usually sits under Cellular, Cellular Data Network, but not every phone shows that field for an eSIM, because it can be locked by the profile. Apple's roaming page does not describe it, so rely on your provider's instructions.

Only change it if your provider gives you exact values. Typing a guess over a working configuration makes things worse, so note the original values before you edit anything.

Is my data being throttled after a daily cap?

Many plans are sold with a daily allowance and a fair-use rule. Once you pass the cap, the connection does not stop but drops to a much lower speed, which feels exactly like "slow data". The usual signs are that speed was fine in the morning and collapsed in the afternoon, and that it recovers the next day.

Check these:

1. Open your plan details in the provider's app or order page and find the daily or total allowance.
2. Look at the usage figure, if one is shown, against that allowance.
3. Check what background traffic is eating it: cloud photo backups, app updates and video autoplay.
4. If you are throttled, wait for the daily reset or top up if the provider offers it.

Rules differ by provider and plan, so read the terms for yours instead of guessing.

Before blaming the cap, consider congestion. Crowds are a common cause of slow data, and it is worth ruling out before you start changing settings. Stations, airports, night markets, stadiums and festivals can overwhelm a cell, and a few thousand phones in one square can make even a strong signal feel dead.

Test it: walk a few hundred metres, go up a floor or step outside, then run a speed test or load a page again. If speed returns, the eSIM is fine. Indoor spots such as basements, metro platforms and thick-walled buildings also cut speed, and some phone cases make it worse. If you only need to send a message or load a map at a packed event, try again in a quieter moment.

What should I try if nothing works, and when do I reinstall?

Go through these in order, stopping when data comes back:

1. Turn on airplane mode, wait around 30 seconds and turn it off. Apple lists this as a first step for roaming problems.
2. On iPhone, check that Date and Time is set to Set Automatically under Settings, General.
3. Restart the phone.
4. Update the phone software if an update is waiting.
5. Reset network settings (on Pixel, Settings, System, Reset options, Reset mobile network settings). This clears saved Wi-Fi networks, so keep your passwords handy.

Removing and reinstalling the eSIM is a last resort. Many providers issue a QR code that works only once, and deleting the profile may leave you with nothing to reinstall. Ask your provider's support first whether a reinstall is allowed and whether you will get a new code. Never delete the eSIM while you are abroad without that answer.

What else is worth knowing about mobile data for the trip?

Set the eSIM as your data line, keep your home SIM on for SMS and verification codes, and turn off data roaming on the home line to avoid surprise charges. MochiSim eSIMs are data only, so there is no phone number to receive calls or texts on the travel line.

Before you fly, install the eSIM while you are still on Wi-Fi, check your plan's 5G and fair-use terms, and screenshot the provider's support details. Having these ready makes every problem above quicker to solve, especially when you land tired and need data before you can look anything up.