- Tìm sim có số 6789 bạn hãy gõ 6789
- Tìm sim có đầu 098 đuôi 6789 hãy gõ 098*6789
- Tìm sim bắt đầu bằng 098 đuôi bất kỳ, hãy gõ: 098*
How to Check Balance and Data on Vietnamese SIM (English Guide)
Quick reference for foreigners using Vietnamese SIMs. This guide covers all three major carriers — Viettel, Mobifone, Vinaphone — with USSD codes (free), SMS commands, and app instructions.
Quick reference table
| Action | Viettel | Mobifone | Vinaphone |
|---|---|---|---|
| Main balance | *101# | *101# | *101# |
| Bonus balance | *102# | *102# | *102# |
| Data remaining | *098# | *900# | *900# |
| Main menu | *100# | *999# | *888# |
| Validity check | *100*1# | *999*1# | *888*1# |
| Customer service | 198 | 9090 | 9191 |
How to use USSD codes
- Open phone dialer
- Type the code (e.g.,
*101#) - Press call/dial button
- Result appears as popup or SMS within 5-30 seconds
Using SMS to check
Viettel — text "TK" to 900
Receive comprehensive balance summary including main account, bonus, validity dates.
Mobifone — text "TK" to 9090
Same comprehensive summary for Mobifone.
Vinaphone — text "TK" to 900
Vinaphone summary identical format.
SMS cost: 100-200 VND ($0.004-0.008) per query. Result returns within 1-3 minutes.
Using carrier apps (recommended for foreigners)
My Viettel
- Download from App Store / Google Play (search "My Viettel")
- Login with Vietnamese phone number + OTP
- Tab "Tài khoản" (Account) → see all balances
- Tab "Dữ liệu" (Data) → see remaining 4G/5G
- Some menus available in English
My Mobifone
- Download from App Store / Google Play
- Vietnamese-only interface
- Use Google Translate camera mode if needed
My VNPT (for Vinaphone)
- Combined app for VNPT services + Vinaphone
- Download "My VNPT"
- Vietnamese interface, partial English
Understanding Vietnamese SIM balance types
Tài khoản chính (Main Account)
Your "real" money. Used for any service. Persists indefinitely while SIM is active.
Tài khoản khuyến mại (Bonus Account)
Promotional credit from carrier (e.g., free 100,000 VND when topping up 200,000 VND). Can only be used for specific services. Has expiration date.
Data tài khoản (Data Account)
4G/5G data remaining for current month. Resets monthly when plan renews.
Validity period (Hạn nghe gọi)
How long your SIM remains active. Topping up extends validity. SIMs expire if balance reaches zero AND validity expires.
Common scenarios for foreigners
"Why did my data run out so fast?"
Common culprits:
- Auto-update apps over data (disable in phone settings)
- Photo/video backup over cellular (use WiFi only)
- Streaming video at HD quality (lower to 480p)
Check exact data usage: *098# for Viettel.
"I'm running low on validity"
Top up at any 7-Eleven, Circle K, or carrier store. Even 50,000 VND ($2) extends validity by 5-10 days.
"How to top up from international card?"
- Carrier websites accept international cards
- Buy phone scratch cards at convenience stores
- Use payment apps (Grab, MoMo) if you have Vietnamese bank link
FAQ
Why doesn't *101# work for me?
Possible causes: SIM not yet activated, no signal, incorrect format. Try restarting phone and dialing again.
Can I check balance via international roaming?
Yes for USSD codes (free) and SMS. Apps require data connection — may incur roaming charges.
How often should I check balance?
For tourists: weekly. For premium SIM holders: monthly to ensure validity.
What if my SIM expires while I'm abroad?
Top up via carrier website with international credit card. Or have a friend/relative in Vietnam top up at a store using your phone number.
Sim Tài Lộc auto-recharge service?
For premium SIM customers, we offer quarterly auto-recharge service to prevent expiration. Contact international@simtailoc.vn for setup.
📞 Sim Tài Lộc 1900.0000 — English support for SIM management.
