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Southeast Asia

SIM Cards in Vietnam and Thailand 2026 — Best Options and Where to Buy

AIS vs True vs Viettel vs Vinaphone for tourists, eSIM vs physical, airport pricing vs 7-Eleven, and tethering rules.

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8 min read

Airport booths

Convenient but sometimes premium; fine for first 30 days if you want connectivity immediately.

7-Eleven top-ups

Thailand tourist SIMs widely sold; keep passport handy for registration rules.

Vietnam

Viettel and Mobifone dominate; verify passport registration sticker; eSIM availability improving.

Tethering

Plans differ; read fine print if you hotspot a laptop all day.

eSIM vs physical: travel style decides

eSIM shines for same-day arrival data. Physical SIM helps if you swap devices or need the shop to debug APN settings for tethering.

Tethering and fair-use myths

  • Read FUP tables on unlimited plans
  • Confirm hotspot allowances for laptop work
  • Top up before weekends when queues grow

Carriers occasionally retire tourist SKUs; screenshot plan details at purchase.

Dual-SIM phone setup

Keep home number on silent for OTPs; route data through local SIM to avoid roaming shocks.

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