· Luke Faragher · Call Recording · 7 min read
How to record business mobile calls (UK guide)
Two ways to record business calls on a mobile in the UK, an app on the device or at the network level via a mobile operator, with the honest trade-offs of each and what to look for when comparing providers.
There are two ways to record calls on a mobile phone in a UK business context. They produce wildly different results. The right answer depends on whether “recording” means “I want a record of this conversation for my own reference” or “the firm must demonstrate, on demand, that every regulated call was captured.”
This guide walks through both approaches with the honest trade-offs of each, and what to look for when comparing network-level providers (because that’s where the meaningful differences live, not in the underlying tech).
The two approaches
- App-based recording, a third-party app or built-in phone feature records the call on the device
- Network-level recording, the recording happens on the mobile network via your mobile operator or MVNO, not on the device
For most personal use, option 1 is fine. For business use, especially where reliability or compliance matter, option 2 is what serious operations land on. Here’s why.
Approach 1, App-based recording
A third-party call-recording app runs on the device. When the user starts a call, they tap the app to begin recording. The recording is stored locally on the phone (or uploaded to the app vendor’s cloud).
What it’s good at
- Cheap or free per user
- Quick to deploy, just install an app
- Fine for occasional personal-reference recording
What it’s bad at
- Reliability, the user has to remember to enable the recording on each call. If they forget, the call is lost.
- OS updates break things, Apple and Google have repeatedly tightened mobile call APIs. Apps that worked last month sometimes stop working after an OS update, often silently.
- iPhone is particularly hard, Apple doesn’t expose direct call audio to third-party apps. Most iPhone “call recorders” actually work by bridging the call through a conference-call service (the recording is made on the bridge, not on the phone). This adds latency, occasionally drops calls, and produces lower audio quality.
- On iOS 18 and later, the native Phone-app recorder plays a mandatory announcement to the other party. Apple built call recording into the Phone app on iOS 18, but when you tap the record button, iOS plays “This call will be recorded” (followed by a beep) to everyone on the call. It is not optional and cannot be disabled. For business use this changes the caller experience partway through the conversation, which many customer-facing teams find undesirable. The standard business alternative is to notify the caller at the START of the call with the familiar “this call may be recorded for training and quality purposes” message, which is exactly what network-level recording lets you configure.
- No central archive, recordings sit on the device until the user uploads them. If the device fails, recordings are lost.
- Hard to demonstrate compliance, auditors looking for “evidence that every regulated call was recorded” can’t get that from app-based recording, because nothing forces the user to enable it.
Verdict
Fine for personal reference. Bad for any business use where the recording needs to be reliably present.
Approach 2, Network-level recording
The recording happens on the mobile network itself, not on the handset. The user makes a call as normal from their phone’s built-in dialler; the mobile operator (or MVNO) captures the call and stores the recording centrally.
All network-level recording works this way. Whether the provider is a big general mobile operator with a compliance add-on, or a specialist MVNO built around recording (like ONSIM), the underlying architecture is the same. What differs is the depth of the product built around it, which is where the buying conversation happens.
What it’s good at
- Reliability, every call recorded automatically, no user action required
- Recording is off the device, handsets on the supported devices list work without an app, no app permissions to manage
- No OS-update breakage, recording is at the network layer, not affected by anything Apple or Google do
- Central archive, all recordings in one place, role-based access, exportable
- Compliance-ready with the right provider, for FCA SYSC 10A.1, MiFID II Article 16(7), PCI DSS environments and similar (see FCA compliance details)
- SMS too with the right provider, voice and SMS captured together
- Number porting usually available, keep your existing landline or mobile numbers
What it’s bad at
- Costs more than free apps, expect a monthly per-user subscription rather than a one-off app licence
- Requires a new SIM in most cases, added alongside the user’s personal SIM on a dual-SIM handset (or as an eSIM)
- Sales-led setup for compliance-grade deployments, because retention, integration and scope have to be configured to your requirements
What to look for when comparing network-level providers
Because the underlying architecture is the same across providers, the meaningful differences are operational. Ask each vendor:
- Is recording a first-class product, or a bolt-on add-on to a general mobile plan? Add-ons from general operators tend to have limited retention, export and search options. Providers built around recording tend to offer more.
- Which compliance archives does the provider integrate with? Look for named integrations with the archive vendor your compliance team already uses (Smarsh, Theta Lake, Verint, ASC, NICE, Global Relay and similar). Ad-hoc export via SFTP or S3 works too if the provider supports it.
- What UK number types are available on the SIM? Some providers only offer 07 mobile numbers, which is a poor fit if you want a landline-presence business number on the mobile.
- What’s included in the headline price? A cheap-looking base can become expensive once storage, search, retention, minutes and porting are added as line items. A flat price with everything included is usually cheaper by the time you total it up.
- Retention and access controls, configurable to your regulatory regime, or fixed?
- UK-based sales and support, or offshore contact centre?
- Contract terms, monthly rolling or multi-year enterprise commitment?
Where ONSIM sits
Recording is a first-class capability for us, not an add-on to a general mobile plan. Most SMB customers pay a flat £20/user/month + VAT covering SIM/eSIM, UK minutes and SMS, the recording itself, secure archival, and search & replay via our dashboard. UK-based sales configure retention, archive integration (Smarsh, Theta Lake, Verint, ASC, NICE, Global Relay and others), and compliance scope during onboarding. Enterprise deployments with long retention or bespoke third-party archive integration are quoted separately. See our business call recording page for the detail.
Verdict
Network-level recording is the serious answer for any business use case where the recording has to be reliably present. The choice between providers comes down to how deep the product is around the recording and how well it fits your compliance and archive setup.
Which approach to pick
| You are… | Use this |
|---|---|
| A private individual recording your own calls for personal reference | App-based (cheap and fine for the purpose) |
| A small business wanting occasional records, low compliance need | Either. If reliability matters at all, network-level is worth the step up |
| A multi-user business where call recording matters for training, quality or dispute resolution | Network-level |
| An FCA-regulated firm | Network-level, apps typically don’t pass FCA scrutiny for regulated activity |
| A merchant taking phone payments (PCI DSS scope) | Network-level with pause-and-resume or split-channel payment (more here) |
| A Teams-compliance firm with staff using mobile outside Teams | Network-level to close the Teams gap (more here) |
What about Microsoft Teams Phone Mobile and operator-connect?
Some mobile operators (Vodafone, Verizon and others) partner with Microsoft to deliver “Teams Phone Mobile”, where your Teams number presents on mobile calls and recording is captured into the Teams stack. This is fine if you already run Teams and your operator offers it. It’s a different model from a dedicated business SIM: tied to your Teams licensing, restricted to specific operators, and doesn’t deliver a UK landline-presence on the mobile (which is what most SMBs actually want from a business mobile SIM).
ONSIM’s model is independent: UK SIM with network-level recording, no Teams licensing dependency, landline-presence outbound caller ID supported.
Getting started
If you’ve decided network-level recording is the right shape for your business:
- Business call recording overview, the main page
- FCA call recording compliance, for regulated firms
- PCI DSS call recording, for merchants taking phone payments
- Teams call recording compliance, for firms running Teams alongside mobile
- Request a quote or call +44 333 880 4008
And if you’re still working out whether recording is legally required in your situation, start with Is it legal to record a phone call in the UK? for the regulatory baseline.
