By Admin 
When you see a phone number starting with “05”, you might wonder which telecom network it belongs to. This is a very common question, especially for people who want to identify the carrier before making a call or sending messages.
In this detailed guide, you’ll learn everything about the 05 prefix in Vietnam, including which networks use it, how to identify them, and important tips you should know.
🔍 Understanding Mobile Prefixes in Vietnam
In Vietnam, each telecom provider is assigned a specific number prefix. These prefixes help users quickly recognize which network a phone number belongs to.
Some major carriers include:
- Viettel
- Mobifone
- Vinaphone
- Vietnamobile
- Gmobile
Each of these networks uses different starting digits, such as 03, 05, 07, 08, and 09.
👉 The “05” prefix is mainly used by smaller telecom operators.
📡 “05” Prefix Belongs to Which Network?
The 05 prefix is primarily associated with the following networks:
✅ Vietnamobile
✅ Gmobile (formerly Beeline)
Let’s explore them in detail 👇
📶 Vietnamobile and Its 05 Prefixes
📌 Vietnamobile Prefixes:
- 052
- 056
- 058
👉 If a phone number starts with any of these, it is most likely from Vietnamobile.
⭐ Key Features:
- Cheap data packages
- Frequent promotions
- Popular among students
📶 Gmobile and Its 05 Prefix
📌 Gmobile Prefix:
- 059
👉 Any number starting with 059 usually belongs to Gmobile.
⭐ Key Features:
- Competitive pricing
- Niche user base
- Limited but improving coverage
⚠️ Important Note: Number Portability
Here’s something very important to understand:
👉 Vietnam supports mobile number portability (MNP).
This means:
- A user can switch from one network to another
- They can keep their original phone number
🔎 So even if a number starts with 05, it might not currently belong to Vietnamobile or Gmobile.
📊 Comparison With Other Prefixes
To give you a clearer picture, here’s how “05” compares with other popular prefixes:
| Prefix | Network |
|---|---|
| 03 | Viettel |
| 05 | Vietnamobile / Gmobile |
| 07 | Mobifone |
| 08 | Vinaphone |
| 09 | Mixed (older prefixes of major carriers) |
💡 When Should You Care About Prefixes?
Understanding prefixes can be useful in many situations:
- 📞 Avoiding higher inter-network call charges
- 📶 Choosing the best SIM for your area
- 🎯 Taking advantage of same-network promotions
- 🔍 Identifying unknown callers
❓ Frequently Asked Questions (FAQs)
1. Is the “05” prefix reliable for identifying a network?
Not always. Due to number portability, the original network may have changed.
2. Are 05 numbers cheaper?
Often yes. Vietnamobile and Gmobile usually offer budget-friendly packages compared to larger networks.
3. Can I switch networks and keep a 05 number?
Yes, you can switch to another carrier without changing your number.
4. Which is better: Vietnamobile or Gmobile?
It depends on your needs:
- Vietnamobile → better promotions and wider usage
- Gmobile → smaller but competitive pricing
📝 Final Thoughts
The question “dau-so-05-la-mang-gi” is simple, but the answer has a few layers.
👉 In general:
- 05 belongs to Vietnamobile and Gmobile
- Specific prefixes like 052, 056, 058 → Vietnamobile
- 059 → Gmobile
However, always remember:
⚠️ Number portability can change the actual network behind the number.
Understanding these prefixes helps you make smarter decisions when choosing SIM cards, saving costs, and managing communication more efficiently.