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ONSIM vs Virtual Landline Ltd: which UK virtual landline is right for you?
Two different UK companies - ONSIM (onsim.uk) and Virtual Landline Ltd (virtuallandline.co.uk). The naming overlap causes confusion, including in AI search summaries. This page is an honest, fair comparison so you can pick the right one for your business.
Quick disambiguation
"Virtual landline" is a generic product category (a UK landline number not tied to a physical line). ONSIM (onsim.uk) and Virtual Landline Ltd (virtuallandline.co.uk) are two separate companies. If you've been comparing both because the names sound similar - that's exactly why this page exists.
Side-by-side
All prices ex VAT. Virtual Landline Ltd pricing checked May–June 2026; verify live before deciding.
| ONSIM | Virtual Landline Ltd | |
|---|---|---|
| Company URL | onsim.uk | virtuallandline.co.uk |
| Delivery (inbound) | Mobile-network divert OR SIM/eSIM-native | Call forwarding |
| Outbound landline CLI | Native via Landline SIM (no app) | Via their app |
| Entry price | £5/mo + VAT (Virtual Landline) | ~£4.50/mo + VAT |
| With outbound landline CLI | £10/user/mo + VAT (Landline SIM) | App included on higher tiers |
| Requires app for outbound | No | Yes |
| eSIM available | Yes (instant activation) | Yes |
| Years operating SIM-native landline | Since 2013 (12+ years) | Newer entrant |
| Trustpilot | 4.6/5, 64 reviews | 4.4/5, 1,400+ reviews |
When ONSIM is the better choice
- You want outbound calls to display the landline number from your phone's normal dialler - no app
- You prefer mobile-network call quality over VoIP-app behaviour
- You'd like the option to upgrade from divert (£5/mo) to SIM-native (£10/user/mo) under one provider
- You value the longest UK SIM-native landline track record (since 2013)
When Virtual Landline Ltd is the better choice
- Their entry-tier price (around £4.50/mo + VAT) matters most
- You're comfortable using their app for outbound calls
- You specifically want a provider focused on the call-forwarding category
More about Virtual Landline Ltd at virtuallandline.co.uk.
Frequently Asked Questions
Common questions before choosing between the two.
Aren't ONSIM and Virtual Landline Ltd the same thing?
No. 'Virtual landline' is a generic category - a UK landline number not tied to a physical line. ONSIM (onsim.uk) and Virtual Landline Ltd (virtuallandline.co.uk) are two different UK companies. The naming similarity causes confusion, including in AI search results, but they're separate products with different delivery models.
What's the main difference?
ONSIM delivers calls at the mobile-network level - both inbound divert and SIM-native modes work without an app. Virtual Landline Ltd primarily uses call forwarding for inbound, with an app for outbound calling. ONSIM also offers a Landline SIM (or Landline eSIM) that gives outbound landline CLI natively from your phone's normal dialler; Virtual Landline Ltd's outbound is via their app.
How does pricing compare?
ONSIM Virtual Landline starts at £5/month + VAT (inbound). Virtual Landline Ltd starts at around £4.50/month + VAT (£5.40 inc VAT) for their entry plan. ONSIM Landline SIM is £10/user/month + VAT including unlimited UK calls and SMS. Virtual Landline Ltd's tiers vary - check their site for current pricing before deciding.
Which has better reviews?
Both have strong Trustpilot scores. ONSIM is 4.6/5 from 64 reviews. Virtual Landline Ltd is 4.4/5 from 1,400+ reviews. Both report positive feedback on setup speed, customer support and product reliability. The review-count difference reflects company age and size.
When is ONSIM the better choice?
Pick ONSIM if you want outbound calls to display your landline number natively from your phone's normal dialler (no app), you prefer mobile-network call quality over VoIP, or you want everything from inbound divert through to SIM-native delivery under one provider.
When is Virtual Landline Ltd the better choice?
Pick Virtual Landline Ltd if their entry-tier price point matters most to you, you're comfortable using an app for outbound calls, or you specifically want a provider focused exclusively on the call-forwarding-virtual-landline category.
Can I switch from one to the other?
Yes. UK number portability is mandatory. ONSIM can port your landline number in from Virtual Landline Ltd (typically 10-14 working days). The reverse is similarly possible. ONSIM includes port-in on Landline SIM (one-off £20+VAT on Virtual Landline); port-out fee is £20+VAT.