Bali has excellent eSIM coverage. Jakarta is well connected. But Indonesia has over 17,000 islands, and the honest truth is that signal drops off sharply once you leave the main tourist routes.
Indonesia
Republik Indonesia
7.8
★★★☆☆
Coverage score
// Why get an eSIM
Saily vs. roaming on your home SIM
| SailyRECOMMENDED | Roaming | |
|---|---|---|
| Setup | 2 min, pre-trip | Automatic |
| Cost | Flat, upfront | Per-day, uncapped |
| Speed | Full local speed | Often throttled |
| Local number | No (data-only) | Keeps your number |
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⚡ POWER TIP
Telkomsel has the best outer-island coverage of any Indonesian carrier. If you are heading to Komodo, Raja Ampat, or remote Sulawesi, make sure your eSIM plan connects through Telkomsel — and download offline content before you leave the main islands.
✅ VPN FULLY LEGAL
Personal VPN use is not banned in Indonesia. The government blocks some content categories (gambling, adult content) but mainstream tourist apps work normally. A VPN is useful for accessing any blocked content and for security on public WiFi.
⏱ Facts verified July 2026 • Always confirm regulations before travel
// Network operators
Telkomsel
Indonesia's largest carrier and the one with the broadest outer-island coverage. Excellent signal in Bali, Java, and Lombok. The best choice if you are heading anywhere beyond the main tourist islands. 4G/5G in major cities. eSIM supported on international plans.
Indosat (IM3)
Strong competitor with good coverage across Bali, Jakarta, and major Java cities. Competitive 4G speeds in tourist areas. eSIM supported. A solid choice if your trip stays on the main islands and you are looking for competitive pricing on data plans.
// The honest picture
Bali, Java, and Lombok
Bali has excellent coverage across virtually the entire island, including Ubud, Seminyak, Canggu, Uluwatu, and Nusa Dua. Java (Jakarta, Yogyakarta, Surabaya) is well covered. Lombok is reliable around the main tourist areas. These are the 7.8 score highlights.
Outer islands and remote areas
Komodo Island, Raja Ampat, remote Sulawesi, and the Gili Islands can have very limited or no signal. The score of 7.8 reflects this gap honestly — it is not a failure of the networks but a consequence of the geography. Always download offline essentials before leaving the main islands.
💡 Before you leave the main islands
Download Google Maps offline for your destination area, save your accommodation address and contact number, and download any key content before heading to remote islands or dive sites. Most liveaboard dive operators and island resort boats will have no coverage for extended periods of transit.
// Practical tips
Emergency number: 112
Indonesia uses 112 as its unified emergency number (police 110, ambulance 118 also work). English-speaking operators are available in major tourist areas including Bali, but response times and standards vary significantly outside Bali and Jakarta.
Gojek and Grab are essential
Both Gojek (Indonesian) and Grab are used for rides, food delivery, and errands across Indonesia's cities. Both require active data to book. Your eSIM is the difference between navigating Bali's traffic easily and being at the mercy of metered taxis.
Volcano and natural disaster alerts
Indonesia sits on the Ring of Fire. Active volcanoes like Mount Agung in Bali and Mount Merapi near Yogyakarta issue real eruption alerts. Keep your data active and notifications on — local disaster alerts (BPBD) come via mobile network and matter here in a way they do not in most destinations.
// Travel security
Protect your identity abroad
Resort WiFi, café hotspots, and villa networks carry the same risks as anywhere in the world. Use your eSIM data for sensitive logins and banking. A VPN on public WiFi is good practice and is unrestricted in Indonesia.
Alternative ID for sign-ups
Booking platforms, activity operators, and tourist apps collect personal details. A disposable email and identity keeps your real information private — particularly worth doing for one-off sign-ups you will never use again after your trip.
Surfshark Alternative ID
Generate a disposable identity for every app you sign up to abroad. Your real details stay private.