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ONSIM vs Ringover: simple landline SIM or cloud contact centre?
These two sit at opposite ends of UK business telephony. Ringover is a cloud-VoIP and contact-centre platform - AI transcription, power diallers, CRM integrations, coaching tools. ONSIM delivers a landline number natively over the mobile network: no app, no VoIP, no broadband dependency, from £5/month.
This page is a fair side-by-side. Pick the one that fits your business, not the louder marketing.
Side-by-side
All prices ex VAT. Ringover pricing checked July 2026 on ringover.co.uk (annual-commitment rates); verify live before deciding.
| ONSIM | Ringover | |
|---|---|---|
| What it is | SIM-native landline + call divert | Cloud VoIP / contact-centre platform |
| Delivery | Mobile network - SIM/eSIM or divert | Internet - apps, browser, desk phones |
| Requires app | No | Yes |
| Entry price | £5/mo + VAT (Virtual Landline) | SMART ~£17/user/mo (12-mo commitment); Quicktalk £15 for 1-2 users |
| Fuller tier | £10/user/mo + VAT (Landline SIM, unlimited UK calls/SMS) | BUSINESS ~£32/user/mo (12-mo commitment) |
| Contract | Monthly rolling, cancel anytime | 12-month commitment for headline rates |
| IVR, queues, smart routing | Paid add-ons | Included (advanced on BUSINESS+) |
| AI transcription / call summaries | Enterprise tier only | Included across plans |
| Power dialler / call campaigns | No | Yes (BUSINESS/ADVANCED) |
| CRM/ATS integrations | No (Enterprise: sales-led) | 100+ native integrations |
| Call quality during broadband outage | Unaffected (mobile network) | Depends on internet/mobile data |
| Trustpilot | 4.6/5, 64 reviews | 4.5/5 (plus 4.7 Capterra, 4.6 G2) |
When ONSIM is the better choice
- You need a professional landline number, not a software platform - at £5-£10/month instead of £17-£32/user/month
- Your team is mobile-first and you want zero app friction (Landline SIM)
- You want monthly rolling terms, not a 12-month commitment
- Call quality must never depend on Wi-Fi, broadband or an app
- You're replacing a copper PSTN line before January 2027 (Landline Replacement works with analogue phones)
When Ringover is the better choice
- You run a sales, recruitment or support team that lives in a CRM/ATS - 100+ native integrations
- You want AI transcription, call summaries, analytics and coaching tools (double listening, whisper)
- You need outbound productivity: power diallers, parallel dialling, call campaigns
- You need call queues, advanced IVR and contact-centre routing as core features
- You call internationally a lot - unlimited calls to 110 destinations are bundled
More about Ringover at ringover.co.uk.
Frequently Asked Questions
Common questions before choosing between the two.
What's the main difference between ONSIM and Ringover?
Category, mostly. Ringover is a cloud-VoIP and contact-centre platform: softphone apps, IVRs, call queues, AI call transcription and summaries, power diallers, analytics, coaching tools and 100+ CRM/ATS integrations. ONSIM is a SIM-native landline provider: a UK landline number delivered over the mobile network as a £5/month divert or a £10/user/month Landline SIM - no app, no VoIP, no broadband dependency. One is a phone platform for teams that live in software; the other makes a business number behave like a normal mobile call.
How does pricing compare?
ONSIM Virtual Landline is £5/month + VAT and ONSIM Landline SIM is £10/user/month + VAT with unlimited UK calls and SMS (fair use), on monthly rolling contracts. Ringover's published UK pricing as of July 2026: SMART from £17/user/month ex VAT on a 12-month commitment (more on monthly billing), BUSINESS around £32/user/month, plus a £15 Quicktalk plan for 1-2 user teams - verify live at ringover.co.uk. For a 5-person team, that's roughly £50/month on ONSIM vs £85+/month on Ringover - but they're buying different things.
When is Ringover the better choice?
Pick Ringover if you're running a sales, recruitment or support operation where the phone system is a productivity tool: power and parallel diallers, AI transcription and call summaries, double-listening and whisper for coaching, call queues and smart routing, and native integrations with Salesforce, HubSpot, Bullhorn and 100+ other tools. ONSIM has none of that depth and doesn't pretend to - for a call-centre-style team, Ringover is simply the right category of product.
When is ONSIM the better choice?
Pick ONSIM if you just need a professional UK landline number that works everywhere your mobile works. The Landline SIM puts the number on a SIM/eSIM: calls ring and dial natively with no app to keep logged in, quality never depends on Wi-Fi, and the whole thing costs £10/user/month. It suits trades, field teams, sole traders and businesses replacing a copper line before the January 2027 PSTN switch-off.
Do both work on mobile?
Yes, but differently. Ringover runs as an app on your phone using data/Wi-Fi - full features, but calls depend on connectivity and the app being active. ONSIM is the SIM itself: the landline number rings the phone natively like any mobile call, with VoLTE quality on the EE network, and works in 39 Roam-Like-At-Home countries on UK allowances.
Can I port my number between Ringover and ONSIM?
Yes, in both directions - UK number portability is mandatory and both providers support porting (Ringover includes porting fees in its contracts). ONSIM ports most UK landline numbers in within 10-14 working days; port-in is included on Landline SIM (one-off £20+VAT on Virtual Landline) and the port-out fee is £20+VAT.
What about contracts?
ONSIM is monthly rolling - cancel anytime. Ringover's headline per-user prices are based on a 12-month commitment, with higher rates for monthly billing. If you want to avoid annual lock-in, that's a structural difference worth weighing.
Could a business use both?
Genuinely, yes. Some businesses run Ringover (or similar) for a desk-based sales or support team and give field staff ONSIM Landline SIMs so their mobiles present the same business number without app friction. Numbers can be arranged so the public-facing number rings wherever it needs to.