Staying Connected

An eSIM solves most of the problem. The rest is geography and discipline.

Connectivity in Asia is generally better than at home. The 4G in central Tokyo or Bangkok is faster than your suburban broadband, the 5G in Saigon and Jakarta is rolling out aggressively, and a working data SIM costs a few dollars for a couple of weeks. The job has shifted from finding signal to managing it — choosing the right SIM before you fly, knowing where coverage thins out, and remembering occasionally to put the phone down.

Table of Contents

eSIM Providers: Airalo, Holafly, and Local

If your phone is from the last few years it almost certainly supports eSIM, and an eSIM bought before you fly is the simplest possible answer to the SIM question. Airalo is the largest provider and works fine in Japan, Thailand, Vietnam, Indonesia, and most of Asia — the prices are not the cheapest, but the convenience is unbeatable: install on the plane, switch on at landing, online before you reach baggage claim. Holafly sells unlimited-data plans which are useful for video-heavy trips. For longer stays, a local SIM bought at the destination airport is almost always cheaper than an eSIM — expect to pay a few dollars for ten or twenty gigabytes valid for a month — and the airport kiosks in Bangkok, Saigon, Hanoi, and Denpasar are well-set-up for tourists.

Japan Pocket WiFi

Japan’s mobile market is unusual in that the local SIM ecosystem is hostile to short-term tourists — data SIMs require Japanese-language sign-up at the carrier shop and a long contract — and so a parallel industry of pocket WiFi rentals grew up to fill the gap. You reserve online, pick up the device at the airport (Narita, Haneda, or Kansai all have counters), drop it in a postage-paid envelope at a post box on your way out. It works for the whole family on one device. With eSIMs now available, the case for pocket WiFi has narrowed — an Airalo Japan eSIM is simpler if you are travelling solo — but for a family of four, the rental device is still cheaper and easier than four separate eSIMs.

Vietnam’s Cheap Data SIMs

Vietnam has some of the cheapest mobile data in the world. A Viettel or Vinaphone tourist SIM costs around five dollars at the Hanoi or Saigon airport for thirty days of effectively unlimited 4G, and coverage is excellent everywhere except the deepest mountain valleys of the north. Bring your passport — SIM registration is mandatory. The kiosks inside the international arrivals hall are fine; the men outside offering SIMs from a folding table are not. If you are arriving late and the kiosks are closed, an Airalo eSIM will get you through the first twelve hours and you can switch to a local SIM the next day.

Indonesia Coverage Realities Outside Bali

Telkomsel coverage is excellent in southern Bali, in Jakarta, in Yogyakarta, and along the main tourist arteries. It thins out fast in the islands east of Bali — Lombok is mostly fine, the Gilis have working but congested signal, Flores has 4G in the towns and nothing between them, the Komodo islands have a single tower at Labuan Bajo. In northern Sumatra, eastern Java, and Sulawesi, expect to lose signal for hours at a stretch, and download offline maps in advance. The internet at small Bali villas is surprisingly variable; do not assume that a beautiful villa has working WiFi until you have tested it.

When to Deliberately Go Offline

The harder skill, and the one that separates a trip from a working holiday, is choosing when not to be reachable. A morning in a Kyoto temple is improved by leaving the phone at the ryokan. A long boat day on the Mekong is improved by airplane mode and a paperback. A sunrise on Mount Bromo is improved by not photographing the sunrise. The question is not whether you can stay connected — you almost always can — but whether the connection is paying for itself in any given hour. The discipline of one offline day per week, set in advance, is the single change most travellers report makes their trips feel longer and richer.

VPNs in Countries That Need Them

Vietnam blocks or throttles a few services intermittently — some Google services, occasional social platforms — and a VPN smooths over the inconsistency. China is a different problem entirely and requires a VPN bought and configured before you arrive, because the App Store inside China does not sell VPN apps. ProtonVPN, Mullvad, and ExpressVPN all work in Asia; install at least two before you leave home so you have a fallback if one is blocked on the day. Most other countries in our region — Japan, Thailand, Indonesia, Singapore, Malaysia, the Philippines — do not require a VPN for ordinary use. Use one anyway on hotel WiFi for banking and email; the small overhead is worth it.

Video Calls Home Across Timezones

Asia is anywhere from twelve to nineteen hours offset from North America. The window that works for both ends — your evening, their morning — is roughly nine to eleven at night your time, six to eight in the morning theirs. Set a recurring slot at the start of the trip rather than negotiating it call by call, and let the people at home know you will not always make it. WhatsApp video is the standard across Asia for international family calls; FaceTime works fine wherever Apple devices outnumber Android, which is most of Japan and parts of Singapore. WeChat is necessary if you are calling anyone in mainland China.

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