Three UK Roaming in Vietnam: Rates, Hidden Fees, and Alternatives (2026)
Updated May 2026 · By The Roaming Cost Desk
Short Answer:
Three UK charges £2.75/day for roaming in Vietnam. A 7-day trip costs £19.25 in Three UK fees. A travel eSIM covers that same week for $3.49. You save $15.76 with HelloRoam. No contract changes needed.
Three UK Vietnam roaming rates
All Three UK plans available for Vietnam.
| Carrier | Daily | 7-day | 14-day | Data | Verdict |
|---|---|---|---|---|---|
Go Roam (new customers) £2.75/day EU from December 2025. £5–£8/day worldwide depending on join date. | £2.75 | £19.25 | £38.50 | 12GB cap | No longer free |
Go Roam (new customers) Details
Go Roam (new customers) costs £2.75/day in Vietnam. Data is 12GB cap at 4G speed. £2.75/day EU from December 2025. £5–£8/day worldwide depending on join date.. Three ended free roaming for new customers in October 2021. Dec 2025: EU rate raised to £2.75/day. Oct 2021–Dec 2025 customers: £2/day EU. Pre-Oct 2021 customers: still free under legacy Go Roam terms.
What's included with Three UK in Vietnam
Data, voice, and SMS details.
Data Allowance and Speed
12GB cap at 4G speed on Viettel, Vinaphone. £2.75/day EU from December 2025. £5–£8/day worldwide depending on join date.. Local networks in Vietnam average 52 Mbps.
Voice and SMS Rates
Three UK includes voice and SMS in the daily roaming charge. The £2.75/day rate covers data, voice, and texts. Additional per-minute or per-message fees do not apply within the covered plan.
Hidden charges for Three UK in Vietnam
Three Go Roam in Vietnam: GBP2.75/day
Three charges GBP2.75/day via Go Roam in Vietnam. 12GB daily cap. Legacy customers (pre-Oct 2021) may roam free.
Three Go Roam pricing in Vietnam
Vietnam is in Three's 71-country Go Roam coverage list. Current customers pay GBP2.75/day with a 12GB daily data cap. A 8-day trip costs GBP22.00. Three raised EU rates from GBP2.00/day to GBP2.75/day in December 2025. Customers who signed contracts between October 2021 and December 2025 may be on the older GBP2.00/day rate. Check your plan terms.
Three legacy free roaming in Vietnam
Three UK customers who signed contracts before October 2021 may still have free Go Roam included in their plan. Three's original Go Roam proposition was a key differentiator: free roaming in 71 countries with no daily charge. After October 2021, Three ended free roaming for new customers. Legacy free roaming is subject to a 12GB monthly fair use cap. If you joined Three before October 2021, check your plan documents to confirm free Go Roam eligibility.
Three 12GB daily cap in Vietnam
Three caps roaming data at 12GB per day in Vietnam. After 12GB, data is suspended until the next calendar day. This cap applies to both paid and legacy free Go Roam customers. Heavy data users who stream video, tether devices, or upload large files will hit the cap. At 1-3GB per day of normal travel usage (maps, messaging, social media), the 12GB cap is rarely a concern.
Three UK vs travel eSIM for Vietnam
A 8-day trip costs GBP22.00 on Three Go Roam versus $3.49 for a travel eSIM. The eSIM has no daily data cap beyond the total plan allowance, runs on Viettel and Vinaphone at full LTE speed, and does not count against any domestic fair use policy. For Three customers on legacy free Go Roam, the carrier option costs nothing but is subject to the 12GB daily cap. For paid Go Roam customers, the eSIM is cheaper and faster.
Does Three UK work in Vietnam?
Three UK does not include Vietnam in its Go Roam destinations. Your phone may connect to local networks, but you will pay per-MB rates.
Vietnam is not included in Three's Go Roam list of 71+ countries. If your phone connects to a local network, Three charges per-MB rates that add up fast. A travel eSIM is the better option for Vietnam.
Vietnam is outside Three's Go Roam coverage. Per-MB charges apply.
How much does Three UK charge in Vietnam?
Three UK charges £8.00/day in Vietnam. A 7-day trip costs £56.00 in roaming fees alone. A travel eSIM saves $52.51 on the same trip.
| Trip | Three UK | eSIM | Savings |
|---|---|---|---|
| 3-day trip | £24.00 | $3.49 | $20.51 |
| 7-day trip | £56.00 | $3.49 | $52.51 |
| 14-day trip | £112.00 | $3.49 | $108.51 |
| 30-day trip | £240.00 | $3.49 | $236.51 |
A HelloRoam eSIM for Vietnam starts at $3.49 for the entire trip, with 1GB at local network speeds. No daily fees, no hidden charges, no contract.
eSIM alternative for Vietnam
Same networks, fraction of the cost.
Why an eSIM beats Three UK roaming
A travel eSIM connects to Viettel, Vinaphone at full LTE speed for $3.49 total.Three UK charges £2.75 per day for the same networks. The eSIM has no daily charges, no auto-enrollment, and no hidden fees.
- ✓204+ carrier networks worldwide
- ✓180-day refund policy
- ✓Instant QR install
- ✓Instant QR install
- ✓5G where available
- ✓Keep your home number
- ✓Instant QR install
- ✓5G where available
- ✓Keep your home number
Setup Guide: eSIM Alongside Three UK
- 1Put your phone in airplane mode before takeoff.Prevents Three UK auto-enrollment in roaming passes.
- 2Buy a travel eSIM for Vietnam.HelloRoam, Airalo, and Saily sell Vietnam plans from $3.49.
- 3Install the eSIM via QR code.Label it "Vietnam data." Keep your Three UK line for SMS.
- 4Switch data to the eSIM after landing.Disable Three UK data roaming. Enable eSIM for data only.
- 5Switch back when you return home.Return to Three UK for data. The eSIM stays for next time.
Cost comparison: Three UK vs eSIM in Vietnam
Savings across different trip lengths.
| Trip Length | Three UK Cost | eSIM Cost | You Save |
|---|---|---|---|
| 3 days | £8.25 | $3.49 | $4.76 |
| 7 days | £19.25 | $3.49 | $15.76 |
| 14 days | £38.50 | $3.49 | $35.01 |
| 30 days | £82.50 | $3.49 | $79.01 |
Vietnam network and coverage context
Local Networks
Three UK roaming connects to Viettel, Vinaphone in Vietnam. Average download speed is 52 Mbps. A travel eSIM connects to the same networks at the same speeds for a fraction of the cost.
5G Availability
5G coverage in Vietnam is urban-only. Viettel launched 5G in Hanoi and HCMC in 2024; expanding to major cities Both carrier roaming and travel eSIMs can access 5G where available, depending on your device.
Connectivity Quirks
Grab is essential for ride-hailing; works with international phone numbers
Zalo is Vietnam's dominant messaging app — locals prefer it over WhatsApp
Vietnam has extremely cheap local SIM data — often under $1/GB from carrier stores
Many cafes in Ho Chi Minh City and Hanoi have passwords displayed on receipts or walls
Vietnam blocks some foreign gambling and adult content sites at ISP level