Indian SIM Cards That Work in SE Asia (2026 Guide)
✅ Last verified on-the-ground: 2026-07-18
Jio roaming southeast asia is the cheapest way to keep your Indian number working across Thailand, Vietnam, and the rest of the region. The bill climbs fast without a pack.
Pick the right pack, activate it 4-8 hours before you fly, and your Indian number keeps working from Bangkok to Hanoi to Phnom Penh. Or skip the lot and grab a local SIM. For a broader look at SE Asia backpacking basics, check the SE Asia backpacking hub.
Subodh’s Pro Tip: Don’t wait until you land to activate roaming. Network provisioning on Jio’s side typically takes 4-8 hours from the time you submit the pack request. If you activate at 11pm IST the night before, your SIM is ready by morning. Last-minute activation at the airport lounge is the most common reason travellers end up with no signal on landing.
Quick Answers
| What | Answer | Price (INR) |
|---|---|---|
| Does Jio work in SE Asia? | Yes, in 23+ countries including Thailand, Vietnam, Laos, Cambodia, Malaysia, Singapore, Indonesia | , |
| Does Airtel work in SE Asia? | Yes, in 100+ countries; pack prices vary by destination | , |
| Does Vi (Vodafone Idea) work? | Yes, postpaid IR packs available; prepaid roaming limited | , |
| Jio IR pack (most popular) | ₹4,999 (~$51.85)/ 5 GB / 30 days / 23+ countries | ₹4,999 (~$51.85) |
| Cheapest option for short trips | Local data plan at the airport | ₹574-₹861 (~200-300 THB or ~$5.96-$8.94) |
| Cheapest option for long trips | Local data plan from a Viettel/Mobifone/TrueMove store | ₹574-₹1,436 (~200-500 THB or ~$5.96-$14.89) |
| Activation time | 4-8 hours before departure recommended | , |
| Documents needed for local SIM | Passport + visa + passport photo | , |
| Indian credit card recommended? | No, but forex card saves 2-3% on the recharge | , |
What Is “International Roaming” on an Indian SIM?
International roaming is what your operator calls the service that lets your Indian number make calls, send texts, and use mobile data on a foreign network. When your phone connects to a Thai or Vietnamese tower, your home operator (Jio, Airtel, Vi) has a wholesale agreement with that foreign operator, and they bill you for the usage. Without an IR pack, you’re on “default” or “pay-as-you-go” rates, which are punishingly high for data. With an IR pack, you’ve prepaid a fixed amount for a fixed bundle (say, 5 GB for 30 days) and the per-MB rate drops dramatically.
Three things every Indian backpacker should know:
- The pack must be active before you land. Jio and Airtel both provision IR packs a few hours in advance. You can’t activate at 30,000 feet and expect it to work the moment the wheels touch down.
- Incoming calls are usually free under an IR pack on both Jio and Airtel.
- Roaming disables some features automatically. Aadhaar-linked UPI apps sometimes throw security errors when they detect a foreign IP. Get Nomad eSIM sidesteps this if you keep one Indian line active for OTP and a local SIM for data.
Does Jio Work in Southeast Asia?
Yes. Jio’s international roaming covers 23+ countries as of mid-2026, including every country most Indian backpackers hit:
| Country | Jio IR pack covers? | Network Jio uses |
|---|---|---|
| Thailand | Yes | AIS / dtac |
| Vietnam | Yes | Viettel / Mobifone |
| Laos | Yes | Lao Telecom |
| Cambodia | Yes | Cellcard / Smart |
| Indonesia (Bali) | Yes | Telkomsel |
| Malaysia | Yes | Maxis / Celcom |
| Singapore | Yes | Singtel |
| Philippines | Yes | Globe / Smart |
| Myanmar | No (limited) | , |
The pack you want is the Jio IR ₹4,999 (~$51.85) plan: 5 GB high-speed data, 30 incoming voice minutes (incoming is usually free, the minutes are for outgoing), 30 days validity, valid across the full country list above. There’s a smaller ₹2,999 (~$31.11) pack with 2 GB / 14 days if you’re only doing a Bangkok weekend.
How to Activate Jio International Roaming Before Travel
This is the part most guides skip. Don’t be the person who panics at Suvarnabhumi:
- Recharge your Jio number with at least ₹5,000 (~$51.87) in main balance 24 hours before departure. The IR pack is deducted from main balance, not from a Jio plan.
- Open the MyJio app (not the website, the app works better for IR packs).
- Tap “International Roaming” on the home screen. Select your destination country (Thailand, Vietnam, etc.).
- Choose the IR pack (₹4,999 (~$51.85) for 5 GB / 30 days is the default recommendation).
- Confirm the recharge. You’ll get an SMS confirming the pack is “in provisioning” state.
- Wait 4-8 hours. Jio’s backend needs this window to push the pack to your SIM’s roaming profile. Travellers who activate and immediately fly report the most issues.
- Before boarding, restart your phone once and check that the pack shows up in MyJio under “My Plans.”
- On landing, set the network to “automatic.” Your phone will latch onto the partner network (AIS in Thailand, Viettel in Vietnam) within 60 seconds.
The same flow works on the Jio website (jio.com) under My Account > International Roaming, but the app is faster and shows you partner network names for each country.
Subodh’s Pro Tip: If you have a dual-SIM phone, dedicate SIM slot 1 to Jio (for OTP and incoming calls) and SIM slot 2 to a local SE Asian SIM (for cheap data). Both stay active simultaneously on most modern phones. Set Jio to “data off, SMS on” so background apps don’t burn through your IR pack.
Does Airtel Work in Southeast Asia?
Yes, and Airtel’s IR coverage is wider (100+ countries). The pack structure differs from Jio:
| Airtel IR pack | Data | Validity | Countries |
|---|---|---|---|
| ₹4,999 (~$51.85) IR pack | 5 GB | 30 days | All SE Asia |
| Country-specific packs | Varies | Varies | One country at a time |
Airtel’s activation flow is similar: open the Airtel Thanks app, go to “International Roaming,” pick the destination, choose the pack, and wait 4-6 hours for provisioning. Airtel tends to be slightly faster than Jio on activation, but the packs cost roughly the same per GB.
Airtel postpaid users get one advantage: their IR packs can be billed to the postpaid cycle instead of deducted from main balance. For a family of four travelling together, this can simplify things.
Does Vi (Vodafone Idea) Work in Southeast Asia?
Yes, but only on postpaid plans. Vi prepaid users cannot activate international roaming on most SE Asian destinations, a frequent complaint in traveller forums. If you’re on Vi prepaid, switch to Jio or Airtel for your trip, or activate a Vi postpaid plan 30 days before departure (it requires a credit check and a 12-month commitment).
For Vi postpaid: IR packs start at ₹3,000 (~$31.12) for 3 GB / 10 days. Coverage includes Thailand, Vietnam, Malaysia, Singapore, and Indonesia. Laos and Cambodia are spotty, Vi has fewer partner networks there.
When a Local SIM Beats Indian Roaming
For trips of 7 days or more, a local SIM almost always wins on price per GB. Current rates from carriers and traveller reports (July 2026):
| Country | Local SIM cost | Data included | Validity |
|---|---|---|---|
| Thailand (AIS / dtac / TrueMove) | ₹574-₹861 (~200-300 THB or ~$5.96-$8.94) | 15-50 GB | 8-30 days |
| Vietnam (Viettel / Mobifone / Vinaphone) | ₹184-₹737 (~50,000-200,000 VND or ~$1.91-$7.64) | 3-10 GB/day or 30-60 GB/month | 7-30 days |
| Cambodia (Cellcard / Smart) | ₹289-₹482 (~3-5 USD) | 10-30 GB | 7-30 days |
| Laos (Lao Telecom / Unitel) | ₹86-₹216 (~20,000-50,000 LAK or ~$0.90-$2.24) | 5-30 GB | 7-30 days |
| Indonesia (Telkomsel) | ₹268-₹804 (~50,000-150,000 IDR or ~$2.78-$8.34) | 8-30 GB | 7-30 days |
| Malaysia (Maxis / Celcom) | ₹237-₹710 (~10-30 MYR or ~$2.46-$7.37) | 10-50 GB | 7-30 days |
The math: 5 GB on Jio IR costs ₹4,999 (~$51.85). 30 GB on a Thai AIS tourist data plan costs ₹859 (~299 THB or $8.91), which is ₹29 ($0.30) per GB. Local is 15-20x cheaper per GB on a Thailand trip.
The catch: you need your passport, sometimes a visa page, and occasionally a passport photo to register a local SIM. Most airport kiosks handle it in 10 minutes; downtown stores can take longer if there’s a queue. Read sim card registration rules by country for the per-country paperwork.
Local SIM by Country: The Cheapest Options
Vietnam
The cheap option for backpackers is Viettel or Mobifone tourist SIMs sold at airport kiosks and convenience stores:
- Viettel Tourist SIM (15-day pack): ₹737 (~200,000 VND or ~$7.64), 3 GB/day high-speed, then throttled. Renews automatically if you top up.
- Mobifone Tourist SIM (30-day pack): ₹921 (~250,000 VND or ~$9.55), 60 GB total, no daily cap.
- Vinaphone: ₹368-₹552 (~100,000-150,000 VND or ~$3.82-$5.73), 3-5 GB/day, 7-15 days.
For a Hanoi-Hoi An-HCMC loop, the Mobifone 30-day pack is the best value. Buy it at the airport Viettel/Mobifone counter when you land. They’ll scan your passport and activate it in 5 minutes. Get Nomad eSIM is a useful alternative if your phone supports eSIM and you’d rather not queue at the airport counter.
Thailand
Three carriers, similar pricing:
- AIS Traveller SIM: ₹859 (~299 THB or ~$8.91), 15 GB, 8 days. The most popular among backpackers.
- dtac Happy Tourist SIM: ₹859 (~299 THB or ~$8.91), 15 GB, 8 days. Same price, slightly different coverage.
- TrueMove H Tourist SIM: ₹859 (~299 THB or ~$8.91), 15 GB, 8 days. Best 5G coverage in Bangkok.
Buy at the airport carrier shop in town. AIS has the best 4G coverage on islands like Koh Phangan and Koh Tao. All three require passport registration.
Cambodia, Laos, Indonesia, Malaysia, Singapore
- Cambodia (Cellcard/Smart): ₹482 (~5 USD) at the airport, 10-30 GB / 7-30 days. Smart Axiata is the most reliable in Phnom Penh and Siem Reap.
- Laos (Lao Telecom/Unitel): ₹216 (~50,000 LAK or ~$2.24) for 5 GB / 7 days. Coverage drops sharply outside Vientiane and Luang Prabang.
- Indonesia (Telkomsel): ₹804 (~150,000 IDR or ~$8.34) for 30 GB / 30 days. Dominates Bali and Java.
- Malaysia (Maxis/Celcom): ₹710 (~30 MYR or ~$7.37) for 50 GB / 30 days. Hot tourist data plan.
- Singapore (Singtel/StarHub/M1): ₹747-₹1,495 (~10-20 SGD or ~$7.75-$15.50) for 100 GB / 7-30 days. Tourist-only SIMs available at Changi Airport.
Step-by-Step: How to Set Up Your Phone Before a SE Asia Trip
Use this as your pre-flight checklist:
- Decide your strategy. Indian roaming pack (convenience, less hassle) vs. Local SIM (cheaper, more setup). Many Indian backpackers do both: Jio in slot 1 for OTP, local SIM in slot 2 for data.
- If going with Indian roaming: recharge main balance, activate the IR pack via MyJio/Airtel Thanks 4-8 hours before departure. Confirm pack shows up under “My Plans.”
- If going with local data plan only: disable international roaming on your Indian number before departure to avoid accidental data use at ₹2.50 (~$0.03) per MB. Set “data roaming” to OFF in Android/iOS settings.
- Download offline essentials: Google Maps offline regions for Thailand/Vietnam/Cambodia/Laos, Grab app (works in all five countries), Google Translate with offline Thai/Vietnamese/Lao/Khmer packs.
- Save emergency numbers: India embassy in Bangkok is +66-2-670-2400, Hanoi is +84-24-3845-3737, Phnom Penh is +855-23-210-912. The general SE Asia emergency-assistance rundown lives at emergency contacts guide for backpackers.
- At the airport before boarding: restart your phone once. Check that your IR pack is visible in the operator’s app.
- On landing: switch your network to “automatic” and let it latch onto the partner carrier. Test with a Google search before leaving the airport.
Common Mistakes Indians Make
For more backpacking pitfalls to avoid, see SE Asia backpacking mistakes Indians make.
Mistake 1: “I’ll just activate roaming when I land.” The pack needs 4-8 hours to provision. By the time you deplane, clear immigration, and reach the airport lobby, you’ve spent 90 minutes and your pack is still pending. Travellers report switching to default rates and burning through ₹500-₹1,000 (~$5.19-$10.37) before realising.
Mistake 2: “My UPI works abroad so I don’t need roaming.” UPI works via WiFi at airports, cafes, and hotels. Without data, your phone is offline and you can’t scan QR codes at street stalls. You need a SIM, full stop.
Mistake 3: “Airtel and Jio are the same, I’ll just use whichever.” They aren’t identical. Jio has slightly better packs for SE Asia. Airtel has wider global coverage beyond SE Asia (Japan, Korea, Europe). Pick the operator that fits your trip, not random chance.
Mistake 4: “Local SIMs require a Thai/Vietnamese address, I can’t get one.” They require a passport and sometimes a visa page or passport photo, not a local address. Tourist SIMs are designed for foreigners. Airport kiosks handle this in 10 minutes.
Mistake 5: “I’ll buy a SIM at the hotel.” Hotels don’t sell SIMs (mostly). Buy at the airport carrier kiosk on arrival.
What Most Guides Don’t Tell You
1. Your IR pack might not auto-renew, but your data charges will. If you don’t disable data roaming before departure, a stray WhatsApp notification or iCloud sync at ₹2.50 ($0.03) per MB can rack up a ₹500-₹1,000 ($5.19-$10.37) bill on a single flight. Always toggle “data roaming” OFF on your Indian number and rely on the pack only when you need it.
2. UPI apps throw security errors when they detect a foreign IP on your main SIM. If you keep your Indian SIM in slot 1 with active data, PhonePe or Google Pay may refuse transactions. Easiest fix: keep Indian SIM on data off (use it only for OTP over SMS), put local SIM in slot 2 for all data.
3. Some countries require you to register the local SIM within 24 hours of arrival. Vietnam and Thailand technically require this. The airport SIM purchase counts as registration in practice, but if you buy from a street vendor (don’t), keep the receipt and your passport together. sim card registration rules by country has the per-country specifics.
4. The cheapest “Indian SIM” trick: keep two Indian SIMs. Use Jio (for IR pack) and Airtel (as backup). If Jio’s partner network has a dead zone in rural Laos, Airtel’s partner might not. Costs nothing extra if you already have both SIMs.
FAQ
Q: Does Jio roaming work automatically or do I need to do something?
A: You need to activate an IR pack before you fly. Without a pack, your phone will still connect to a foreign network but you’ll be billed at the default ₹2.50 (~$0.03) per MB rate. The pack itself takes 4-8 hours to provision on Jio’s backend.
Q: How long does it take to activate Jio international roaming before travel?
A: 4-8 hours from the time you submit the pack request in the MyJio app. Most travellers report it being ready in under 6 hours, but Jio’s stated window is up to 8 hours, especially during peak travel seasons like Diwali and Christmas.
Q: Can I use my Jio number for UPI while abroad?
A: Yes, but only if your Indian SIM has active data or you’re connected to WiFi. Many Indian travellers report UPI apps (PhonePe, Google Pay, Paytm) throwing security errors when they detect foreign IP addresses on a roaming connection. The workaround is to keep your Indian SIM on data OFF and use it only for OTP over SMS.
Q: What is the cheapest SIM card in Vietnam for Indian tourists?
A: The Mobifone 30-day tourist SIM at ₹921 (~250,000 VND or ~$9.55) gives 60 GB of data, enough for most backpacker trips. Buy it at the airport Viettel/Mobifone counter when you land; bring your passport and visa page.
Q: Should I get a local SIM or use Jio international roaming?
A: For trips under 5 days, Jio IR is more convenient. For trips of 7+ days, a local SIM is 15-20x cheaper per GB. Many Indian backpackers carry both: Jio in slot 1 for incoming calls/OTP, local SIM in slot 2 for data. For ATM withdrawal costs across the region, see ATM fees in Southeast Asia.
Q: Does Airtel work in Vietnam?
A: Yes. Airtel’s IR pack covers Vietnam (Viettel and Mobifone are the partner networks). The ₹4,999 (~$51.85)/ 5 GB / 30 days pack works across most of SE Asia, including Vietnam.
Q: What happens if I don’t activate an IR pack and just use my Indian SIM abroad?
A: Your phone will still connect to a foreign network and you’ll be billed at default rates: roughly ₹2.50 ($0.03) per MB for data, ₹10-50 ($0.10-$0.52) per minute for outgoing calls. A single WhatsApp video call can cost ₹500-₹1,000 (~$5.19-$10.37). Always activate a pack or disable data roaming.
Subodh’s Take
Indian SIMs in Southeast Asia have improved a lot. Five years ago, you’d land in Bangkok, queue 45 minutes for a tourist SIM, and pray it worked. Today, you can pre-activate a Jio pack from your Mumbai apartment and land with data already running. The decision isn’t “can I use my Indian SIM?” but “is the convenience worth 30x the cost per GB?” For a 4-day Bangkok trip, yes. For a 3-week Thailand-Vietnam-Laos loop, no. Pick the strategy that fits the trip length, activate the pack before you fly, and keep a backup SIM handy for the inevitable partner-network dead zone in rural Laos.
