The short answer is yes. VoLTE (Voice over LTE) is built on modern 4G and 5G network standards, making it significantly more secure than the older 2G and 3G systems it replaces.
When you make a VoLTE call, you aren't just getting better audio; you are getting a higher level of protection for your business conversations.
3 Reasons Why VoLTE is More Secure
1. Advanced Carrier-Grade Encryption
Unlike older 2G networks (which were famously vulnerable to simple "eavesdropping" tools), VoLTE uses robust, modern encryption algorithms (such as AES) to scramble your voice data between your phone and the cell tower. This makes it incredibly difficult for unauthorised parties to intercept or "sniff" your calls.
2. Mutual Authentication
In the days of 2G, only the phone had to prove its identity to the network. This allowed attackers to use "stingrays" (fake cell towers) to trick phones into connecting to them.
The VoLTE Difference: VoLTE requires mutual authentication. This means your phone and the network must both prove their identities to each other before a connection is made, effectively locking out "imposter" cell towers.
3. Network-Level Isolation
VoLTE doesn't travel over the "open" public internet like a standard VoIP app (WhatsApp or Skype). Instead, it travels through a private, dedicated tunnel within the OnSim network.
The Result: Your voice traffic is isolated from regular web traffic, adding a massive layer of defence against common internet-based cyberattacks.
VoLTE vs. Older Technology
| Security Feature | 2G / 3G | VoLTE (4G/5G) |
|---|---|---|
| Encryption Strength | Weak / Outdated | Strong (AES/Carrier-Grade) |
| Protection Against Fake Towers | Low | High |
| Call Interception Risk | High | Extremely Low |
| Identity Protection | Limited | Advanced (IMS Security) |
A Note on "Sunset" Security
UK mobile operators are currently "sunsetting" (turning off) 2G and 3G networks because they are no longer secure enough for modern business needs. Switching to VoLTE isn't just about better quality—it’s about moving your business to a platform designed for 21st-century security.