F40 in Vietnam
The F40 rates good on all 3 networks in Vietnam (Viettel, VinaPhone and MobiFone).
Network by network
| Network | Verdict | Bands in use it supports | Core bands missing |
|---|---|---|---|
| Viettel | ✔ Good 100% | B1 B3 | — |
| VinaPhone | ✔ Good 100% | B3 | — |
| MobiFone | ✔ Good 100% | B3 | — |
Better-rated models here
In Vietnam it is already among the best-rated models.
About the F40
5G RedCap · Hyper Nexus dongle1
- 4G B1 B3 B5 B8 B28 B34 B38 B39 B40 B41
- 5G RedCap n1 n3 n5 n8 n28 n41 n78
Lightweight 5G RedCap dongle (needs 5G SA); 4G as emergency fallback.
Network access: long-term roaming
Many globally deployed IoT devices use multi-network roaming SIMs that can attach to several networks in a country, but some countries restrict long-term roaming by foreign SIMs. A local SIM roaming domestically is not affected.
No clear rule found: No information yet.
All networks and bands in Vietnam → · The F40 in 46 countries →
The F40 product page · Back to the home: ask, enter a model or bands, or compare models
Sources
- A Product specifications and certifications (manufacturer data) Hyper Nexus · 2026-09
