Virtual Landline vs Mobile Number — Key Differences
A virtual landline number and a mobile SIM card both enable voice calls but differ in routing, cost structure and flexibility. Understanding these differences helps you choose the right solution for your situation.
How the Routing Differs
A mobile SIM works via the cellular network. Your device maintains a constant connection to cell towers, and incoming calls are delivered via the mobile switching network directly to your SIM. This requires mobile network coverage wherever you are.
A virtual landline works via the internet. When someone dials your 01/02 number, the call enters the UK telephone network, reaches the VoIP provider's servers, and is delivered over the internet to whichever device or app is registered to receive it. This requires internet connectivity rather than mobile network coverage.
Cost Differences
| Mobile SIM (07) | Virtual landline (01/02) | |
|---|---|---|
| Number format | 07xxx | 01/02xxx |
| Infrastructure | Mobile network | Internet (VoIP) |
| Works abroad | With roaming (extra cost) | Yes — internet only |
| Hardware required | Physical SIM chip | None |
| Prison call rate | 5.5p/min (weekday) | 2.47p/min (weekday) |
| In caller's bundle | Often excluded | Often included |
When to Use a Mobile Number
- You need to make outgoing calls and send SMS from the same number
- You need mobile data as well as voice
- You are in an area with good mobile coverage but unreliable internet
- You want a simple all-in-one solution from a mobile carrier
When to Use a Virtual Landline
- You need a UK geographic (01/02) number for incoming calls
- You want callers to pay lower rates (including HMPPS landline rates)
- You live outside the UK and need to receive UK calls without roaming
- You want a number that works across multiple devices without changing SIM
Reliability Comparison
Both technologies are reliable under their respective ideal conditions. Mobile networks suffer in remote areas or buildings with poor signal. VoIP suffers on congested or slow internet connections.
In urban areas with strong WiFi and 4G, both perform well. For families who are always at home or in areas with excellent broadband, a virtual landline is highly reliable. For people who are frequently in areas without internet access, a mobile SIM is more dependable.