You land in a new country. No WiFi. Your home SIM doesn't work. You can't open Google Maps, call an Uber, or check into your Airbnb. Your bank sends a 2FA code to a number that's now unreachable.
This happens to every expat. And it's completely avoidable.
Key Takeaways
- Buy an eSIM before you fly — Airalo or Holafly, land with data working
- Never cancel your home phone number — port to Google Voice (US) or cheapest plan available
- Get a VPN — NordVPN or ExpressVPN, essential for banking and streaming
- Local SIM for stays 3+ months — cheaper long-term and you'll need a local number
- Test your banking app through VPN before leaving home
- Turkey blocks unregistered phones after 120 days — register your IMEI or buy locally
- Japan doesn't sell prepaid SIMs easily — eSIM is the only practical option
Stay connected, stay productive.
Last updated: March 27, 2026
The eSIM Revolution: Stop Buying Airport SIM Cards
An eSIM is a digital SIM card built into your phone. You download it before you fly, land with data working, and never visit a phone shop. Most iPhones since the XS (2018) and Android flagships since 2020 support eSIM.
Best eSIM Providers Compared
| Provider | Price | Data | Countries | Best For |
|---|---|---|---|---|
| Airalo | From $4.50/1GB | Capped plans | 200+ | Budget travelers, short stays |
| Holafly | From $19/7 days | Unlimited data | 60+ | Heavy data users, streaming |
| Nomad eSIM | From $5/1GB | Capped plans | 100+ | Regional plans (Europe, Asia) |
| Ubigi | From $9/1GB | Capped plans | 190+ | Business travelers |
| Saily (by NordVPN) | From $3.99/1GB | Capped plans | 150+ | Privacy-focused users |
My recommendation: Airalo for short trips (1-2 weeks), Holafly if you need unlimited data, local SIM for stays over 3 months.
Can I Use WhatsApp With an eSIM?
Yes — WhatsApp works with any data connection. Your WhatsApp number stays the same regardless of which SIM or eSIM you're using. It's tied to your original phone number, not your current SIM. Just make sure you have the old number verified before you switch.
The same applies to Telegram, Signal, and other messaging apps. They work on any internet connection — eSIM, WiFi, or local SIM.
Why Every Expat Needs a VPN
A VPN isn't about privacy paranoia — it's about basic functionality abroad:
- Banking: Most banks flag and block logins from foreign IPs. Your Chase, Barclays, or HDFC app stops working the moment you leave the country
- Streaming: Netflix, BBC iPlayer, Hulu show different content (or nothing) based on your location
- Price discrimination: Flight and hotel prices are often higher when browsing from wealthy countries
- Public WiFi security: Café and coworking WiFi is easily intercepted
Best VPNs for Expats
| VPN | Monthly Price | Speed | Best Feature |
|---|---|---|---|
| ExpressVPN | $8.32/mo (annual) | Fastest | Works in China, UAE, Turkey |
| NordVPN | $3.99/mo (2-year) | Fast | Double VPN, threat protection |
| Surfshark | $2.49/mo (2-year) | Good | Unlimited devices, cheapest |
If you only pick one: NordVPN — best balance of price, speed, and reliability. It works for banking in every country I've tested.
Will My Bank App Work Abroad With a VPN?
Usually yes, but not always. Most banking apps work fine when you connect to a VPN server in your home country. Your bank sees a domestic IP and lets you in. However, some banks (especially UK banks like Monzo and Starling) detect VPN usage and may require additional verification. Always test BEFORE you leave home.
Pro tip: Log into your banking app through the VPN while still in your home country. This creates a "trusted session" that's less likely to be flagged later.
Keep Your Home Phone Number — This Is Critical
Do NOT cancel your home country phone number. You'll need it for:
- Bank 2FA codes — most banks send SMS verification
- Government services — tax authorities, immigration portals
- Insurance claims — many require calls from your registered number
- Family and old contacts — not everyone has WhatsApp
How to Keep Your Number Cheaply
| Solution | Cost | Works For | How |
|---|---|---|---|
| Google Voice | Free | US numbers only | Port your number to Google Voice before you leave. Calls/texts over WiFi worldwide |
| Skype Number | $6/month | Any country | Get a local number that rings on your phone via internet |
| TextNow | Free | US/Canada | Free calling and texting over WiFi |
| Port to cheap carrier | $3-15/month | Any country | Move your number to the cheapest plan available (Mint Mobile, giffgaff, etc.) |
Best strategy (US numbers): Port to Google Voice ($20 one-time fee) before you leave. Free calls and texts forever, works anywhere with internet.
Local SIM vs eSIM: When to Get Each
| Scenario | Best Option | Why |
|---|---|---|
| Trip under 2 weeks | eSIM | Instant, no shop visit |
| Stay 1-3 months | eSIM + WiFi | Flexible, no contract |
| Stay 3+ months | Local SIM | Cheapest long-term, local number for banking/housing |
| Need local number for apartment | Local SIM | Landlords and agents want local numbers |
| Need local number for bank account | Local SIM | Many countries require it |
Country-by-Country Connectivity Guide
| Country | Best Local Carrier | eSIM Works? | Avg Speed | Monthly Data Plan | Tips |
|---|---|---|---|---|---|
| Thailand | AIS, DTAC | Yes | 50-150 Mbps | $10/30GB | Buy at 7-Eleven, cheapest data in SE Asia |
| Portugal | NOS, Vodafone | Yes | 100-200 Mbps | €15/15GB | NOS has best coverage outside Lisbon |
| Mexico | Telcel | Yes | 30-80 Mbps | $10/6GB | Telcel dominates coverage, AT&T for cities |
| Germany | O2, Aldi Talk | Yes | 80-150 Mbps | €10/10GB | Aldi Talk is cheapest prepaid |
| Bali | Telkomsel | Yes | 20-80 Mbps | $5/15GB | Buy at airport, Telkomsel has best 4G |
| Japan | Doesn't sell prepaid easily | eSIM best | 100-300 Mbps | $15/3GB eSIM | eSIM is the only practical option for tourists |
| Spain | Orange, Vodafone | Yes | 100-200 Mbps | €15/20GB | Orange has best prepaid deals |
| Colombia | Claro, Tigo | Yes | 20-60 Mbps | $8/10GB | Claro best coverage, Tigo cheapest |
| Vietnam | Viettel, Mobifone | Yes | 30-80 Mbps | $3/30GB | Cheapest data in the world |
| UAE | Du, Etisalat | Yes | 100-300 Mbps | $30/10GB | Expensive, VPN is illegal (but widely used) |
| Turkey | Turkcell, Vodafone | Yes | 50-100 Mbps | $10/20GB | Must register IMEI within 120 days or phone gets blocked |
| Greece | Cosmote, Vodafone | Yes | 50-100 Mbps | €12/10GB | Cosmote best coverage on islands |
| South Korea | KT, SK Telecom | Yes | 200-500 Mbps | $25/daily unlimited | Fastest mobile internet on Earth |
| India | Jio, Airtel | Limited | 20-80 Mbps | $3/30GB | Jio is cheapest, Airtel most reliable |
| Brazil | Claro, Vivo | Yes | 30-80 Mbps | $8/15GB | Vivo best 4G coverage |
WiFi Reliability by Region
- Southeast Asia (cities): Excellent — 50-150 Mbps in cafés, coworking spaces everywhere
- Southeast Asia (rural/islands): Poor — bring a local SIM with data
- Western Europe: Consistent 100+ Mbps — WiFi is reliable everywhere
- Eastern Europe: Surprisingly fast — Romania, Bulgaria have some of the fastest internet globally
- Latin America (cities): Good in capital cities, unreliable outside
- Africa: Improving rapidly — Kenya and South Africa lead, but rural areas struggle
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