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Disclosure: This guide contains affiliate links.
The Checklist
| You need... | Requires | Data-only eSIM? |
|---|---|---|
| Grab registration/login | Phone number (any country works for signup, Thai preferred) | ⚠️ Partial |
| Grab driver calls | Voice-capable number | ❌ No |
| Bank SMS OTPs | SMS-receiving number | ❌ No |
| Food delivery (rider calls) | Voice-capable Thai number | ❌ No |
| Hotel/tour confirmations | Voice or SMS | ❌ No |
| Maps, messaging, browsing | Data only | ✅ Yes |
What Works
Yesim voice plan — real +66 number with SMS and calls from $1.68/day on AIS/DTAC. The simplest eSIM fix.
Thai carrier eSIM (thailandesim.com) — full AIS/True/dtac number from $8.90, the real deal. Note: True eSIMs install only inside Thailand, and outgoing calls/SMS need an in-store passport check.
The Backup Plan
Keep your home SIM active alongside the Thai eSIM (dual SIM). Use your home number for bank OTPs from your own country, and the Thai number (or a data eSIM like Airalo) for everything local. Most eSIM phones support this — it's the ideal tourist setup.
What Doesn't Work
- aloSIM's "free number" → US number, Thai services reject it
- Saily's number add-on → US number, same problem
- Any data-only eSIM for driver calls or SMS OTPs — the number simply doesn't exist
Checked October 2026.