The FlySim blog
What an eSIM is, how to install it on iPhone and Android, how much data you really need, and what to know about each destination.
More guides are available in Hebrew. Go to the Hebrew blog →
eSIM basics
Traveling with kids, a second phone or an iPad? How to connect every device abroad with an eSIM: no physical SIM, no unnecessary roaming fees, and no sharing one hotspot for the whole trip.
eSIM basics
Unlimited data sounds like the safe choice, but it isn't right for everyone. What you actually get with an unlimited daily eSIM, the limits, and how to tell if a data package is better for you.
eSIM basics
How does an AirTag find lost luggage abroad with no GPS and no cellular connection? A simple explanation of Apple's Find My network, its limits, and why your phone needs internet to see the location.
Setup
Install your eSIM at home before the flight, and the plan only starts counting when you land. A short guide: when to install, how to activate, and which mistakes to avoid.
DestinationsJapan
How to get a Suica in Japan, the difference between Welcome Suica and the iPhone app, how to top up, and where else you can pay with it beyond trains. Updated for 2026.
eSIM basics
A complete guide to saving data when you travel: settings for iPhone and Android, WhatsApp, YouTube and offline maps, safe use of public Wi-Fi, and how many GB you really need for a trip.
DestinationsCzech Republic
Planning a family trip to Prague? Free public transport for kids, Prague Castle, the zoo, the water park, the new Petřín funicular, attractions for children and teens, and recommended restaurants.
DestinationsJapan
A one-day Kyoto itinerary hour by hour: riverside coffee in Arashiyama, the Bamboo Grove, the Ryoan-ji rock garden and the Kinkaku-ji Golden Pavilion, with tips on getting around and staying online in Japan.
eSIM basics
Yes. A travel eSIM is added alongside your home SIM, and WhatsApp keeps working with your usual number. Everything to know before your flight, and the mistakes to avoid.
Comparisons
eSIM or physical SIM for your next trip? A full comparison of price vs. roaming, security, device compatibility and convenience, with a table that helps you decide in a minute.
eSIM basics
Before you take off, here's what you need to know to stay connected for your whole trip: install at home, activate on landing, check your phone, and why a travel eSIM is usually data-only.
Setup
Most eSIM problems on a trip have nothing to do with the plan itself. They come from the order of your settings after landing. Exactly what to check, step by step, to get connected within minutes.
Troubleshooting
Your eSIM won't connect? Every common cause and how to fix each one, step by step: data roaming, choosing the right line, APN, manual network selection and more. Includes a quick-fix table.
Setup
A short guide for iPhone and Android: how to turn on data roaming for your eSIM line only, keep it off on your home SIM, and avoid roaming charges from your home carrier.
eSIM basics
A step-by-step guide to enabling data roaming on your travel eSIM line only, so your home SIM doesn't rack up roaming charges. For iPhone, Samsung Galaxy and Google Pixel.
DestinationsThailand
How do you get food delivered on Koh Phangan? A step-by-step guide to the Delivery KPG app: downloading it, ordering, tracking your driver, and tips to know before your first order.
DestinationsThailand
Where to exchange money at Suvarnabhumi Airport in Bangkok? Step-by-step directions to the best-value exchange booths on Level B, how to compare rates, and what you must bring.
ComparisonsThailand
Heading to Koh Samui, Koh Phangan, Koh Tao or Phuket? AIS has the widest coverage on small islands and ferry routes, while DTAC performs well in the main tourist areas. An island-by-island comparison.
DestinationsThailand
Everything about getting a SIM card in Thailand: AIS vs. dtac vs. True, tourist SIM prices by length of stay, physical SIM vs. eSIM, and whether to buy before your flight or after landing.
DestinationsJapan
A full day in Osaka by metro: Osaka Castle, Kuromon Market, the Tempozan Ferris Wheel and sunset at the Umeda Sky Building, with opening hours, prices and directions.
DestinationsThailand
Which apps to download before a trip to Thailand? Taxis, travel between cities and islands, talking to locals and the digital arrival card. Everything you need on your phone, plus internet in Thailand with an eSIM.
DestinationsGreece
Which apps to download before a trip to Greece? Taxis in Athens, ferries to the islands, public transport and translation. Everything you need on your phone, plus how to stay online in Greece with an eSIM.
DestinationsJapan
Almost every tourist SIM and eSIM in Japan is data-only, with no Japanese phone number. Here's the law behind it, why Japan is tightening it, and how to stay connected without a local number.
eSIM basics
A light traveler needs about 0.5–1GB a day, an average traveler 1.5–3GB, and a heavy user 4–6GB or more. Data usage per hour for maps, WhatsApp, social media and streaming, and how to calculate your whole trip.
Setup
Buying, installing and activating an eSIM are three separate steps. Buy and install at home on reliable Wi-Fi, then switch it on when you land, so you don't start the plan too early and lose days.
Comparisons
Pocket Wi-Fi or eSIM for your trip? A simple comparison of convenience, battery, sharing data, pickup and return, and when each option makes sense for solo travelers, couples and families.
Comparisons
An eSIM is a digital SIM built into your phone: you download your plan with a QR code instead of inserting a card. The key differences from a physical SIM, how setup works, and who benefits most.
eSIM basics
5G sounds better, but on a travel eSIM 4G is often the smarter setting: better battery life, wider coverage and fewer dropouts. Five reasons to switch, and step-by-step instructions for iPhone and Android.
eSIM basics
You landed, turned off airplane mode, and your eSIM shows no data. A minute-by-minute checklist that fixes most cases: data line, data roaming, airplane mode reset, APN and manual network selection.
Comparisons
A local eSIM is cheapest for one country, a regional eSIM covers several countries in one area, and a global eSIM works almost anywhere. How to pick the right one for your route and budget.
eSIM basics
What actually happens when you scan an eSIM QR code? A plain-language explanation of eSIM profiles, why you need internet to install but not to use one, how it picks a network abroad, and why each QR code works only once.
Comparisons
Pay per gigabyte or per day? For most travelers a fixed-GB eSIM plan is better value. The difference between the two, how to estimate how much data you need, and when a daily plan makes sense.
eSIM basics
Your phone can run two lines at once: your home SIM for calls, texts and bank codes, and a travel eSIM for cheap local data. How Dual SIM works, when it's useful, and how to set it up on iPhone and Android.
eSIM basics
Bought a 10-day eSIM and already low on data by day three? It's usually background updates, photo backups or streaming, not a faulty plan. How to check your usage and 8 habits that make your data last.
Setup
Signal bars but no internet? It's usually the APN. What the APN does on an eSIM, where to find the right details, and step-by-step setup on iPhone and Android, plus the most common mistakes.
Comparisons
Should you buy your travel eSIM online before you fly, or at an airport counter after landing? A fair comparison of price, availability, choice of plans and troubleshooting, and when each option makes sense.
DestinationsGreece
A 2-day Athens itinerary hour by hour: Ermou Street, Little Kook, Psyrri, the Acropolis and sunset on Lycabettus Hill. Includes ticket prices, practical tips and how to stay online in Greece.
Setup
APN is your phone's route to mobile internet, IMEI identifies the phone itself, and ICCID identifies the SIM or eSIM profile. What each one means, when you'll need it, and how to find it on iPhone and Android.
eSIM basics
An eSIM can work on 5G, but only when your phone, the local network and your plan all support it. How to check each one before you buy, and why most travelers barely notice the difference from 4G.
Troubleshooting
eSIM won't install, no signal abroad, or signal but no internet? We've gathered the common eSIM installation and activation problems on iPhone and Android, with a clear fix for each, so you're connected within minutes.
Setup
Installing an eSIM takes less than two minutes, as long as you know exactly where to tap. Here's the full guide, including the backup method if scanning the QR code doesn't work.
eSIM basics
The best data plan is the one that matches how you actually use your phone, not necessarily the one with the biggest number in the title. How to estimate it properly, and why a small buffer stops your plan from running out on the last day.
