Outbound travel is hot again. Once you've sorted flights and hotels, one task remains: sorting out data. You can technically enable roaming with your home carrier, but for both price and practicality, buying a local plan or a travel eSIM almost always wins.

This is a practical walkthrough based on recent trips — no marketing fluff.

Why pick eSIM over a plastic SIM or roaming

  • Roaming is the most convenient but consistently the most expensive — easily USD 8–15/day with throttled speeds.
  • Plastic local SIMs are cheap but cost you time: airport queues, passport checks, sometimes a 20–40 minute wait.
  • Travel eSIM sits in the middle: you buy and install before flying, activate the moment you land, and you're online while you're still walking to baggage claim.

The three big global providers

For most popular destinations, you'll be choosing between:

  • Airalo — widest country coverage, lowest entry tier. Best for short trips to one country.
  • Nomad — strong regional bundles in Asia / Europe, slick app, smoothest renewal flow.
  • Holafly — premium-priced unlimited plans. Best if you stream or work heavily from your phone.

If you'd like the head-to-head numbers, see Airalo vs Nomad vs Holafly 2026.

End-to-end: buying and installing before you fly

  1. Pick the provider (above) and the country / region pack.
  2. Pay (credit card, PayPal, Apple Pay — all the big ones work).
  3. Receive a QR code by email — usually within a minute.
  4. On WiFi at home, open Settings → Cellular → Add eSIM → Scan QR. The profile downloads. Do not enable it yet.
  5. On the plane or the moment you land, switch the data line to the new eSIM. Most providers start the clock when you connect to a local tower, not when you scan.

The whole loop is 5–10 minutes if your phone supports eSIM.

"Does my phone support eSIM?"

Short answer: most 2023+ flagships do, with one big exception — mainland-China iPhones.

  • International / HK iPhone 12+ → yes, dual eSIM since iPhone 15.
  • Mainland iPhone 15 / 16 / 17 Pro and Pro Max → no (hardware-level disabled).
  • Mainland iPhone 17e → yes, currently in a domestic carrier pilot.
  • Pixel 7+, Galaxy S20+ (most regions) → yes.
  • Huawei / Xiaomi → spotty — varies by model and region.

The full matrix is on the device compatibility page.

What if you have a CN iPhone Pro?

You have four realistic options — pick by trip length and how much you travel:

  1. A programmable physical-format eSIM chip (Estk / 5ber / esim.me). You write the destination's profile to a nano-SIM-shaped chip and insert it like a regular plastic SIM. Works on hardware that doesn't have eSIM at all.
  2. A pocket WiFi router. Zero phone configuration; great for families and groups.
  3. Buy a HK / international iPhone the next time you upgrade. One-time fix.
  4. Borrow a spare international handset for short trips and run an Airalo pack on it for a few days.

The full per-option breakdown is in CN iPhone 16 Pro: 4 workarounds when you don't have eSIM.

Sizing your data pack

Two heuristics that work for me:

  • Light (chat + maps + occasional streaming): 1–1.5 GB / day.
  • Heavy (constant streaming or video calls): 2.5–4 GB / day.

For a per-trip estimate that factors in destination, days, apps used and hours online, use the data calculator — it produces a single GB number plus three plan archetypes (flexible, daily unlimited, fixed GB) that map cleanly onto provider catalogs.

Activation gotchas

  • Don't activate too early. The clock starts at first network connection on most providers.
  • Holafly's "unlimited" has fair use. After 5–10 GB / day you drop to 1–2 Mbps. Still usable; not high-speed.
  • No local phone number. Travel eSIMs are data-only. You won't receive SMS verification codes for Chinese apps (WeChat, Alipay) on the data line — keep your home line on a second eSIM for that.
  • Some providers lock the profile. Holafly profiles in particular cannot be written into third-party programmable chips.

When eSIM doesn't win

If you'll be in one country for more than ~30 days, a local plastic SIM with a monthly plan is usually still cheaper. eSIM wins for trips between roughly 3 days and 3 weeks.

Quick scenario picker

  • 3-day weekend in Tokyo, CN iPhone Pro → borrow an international handset + Airalo 3 GB.
  • 2-week Europe trip, international iPhone → Nomad Europe regional pack.
  • Working remote from Bali for a month, any global phone → Holafly Indonesia unlimited.
  • Inbound to China as a foreigner → Airalo / Nomad / Holafly China pack — see the no-VPN inbound guide.

Where to go next

Still on the fence? Tap AI advisor at the top of any page — describe your phone, destination and days and you'll get a concrete provider + plan in seconds.