VoIP Call Charges Explained: UK Landline, Mobile and International Rates

VoIP Call Charges Explained: UK Landline, Mobile and International Rates

One of the biggest reasons businesses switch to VoIP is the promise of lower call costs. In most cases that promise delivers — but only if you understand how VoIP call charges actually work. Unlike traditional phone lines where pricing was dictated by BT and a handful of carriers, VoIP providers each structure their rates differently, making direct comparisons essential before you commit.

This guide explains exactly how VoIP calls are charged in the UK, what determines the rate you pay and how to ensure your business is on the most cost-effective plan.

How VoIP Call Charging Works

At its simplest, a VoIP call is a data stream sent over the internet rather than a dedicated copper or fibre circuit. The cost of that call depends on where the data stream terminates — whether it stays within the VoIP network, breaks out to the UK public telephone network (PSTN) or routes internationally.

On-Net vs Off-Net Calls

Calls between users on the same VoIP platform — known as on-net calls — are almost always free. The voice traffic never leaves the provider's cloud infrastructure, so there are no interconnect fees to pass on. This is a significant advantage for multi-site businesses and organisations with remote workers, as internal calls between offices and home workers cost nothing.

Off-net calls are those that terminate on a different network, whether that is a UK landline, a UK mobile or an international number. These calls incur termination charges paid by your VoIP provider to the receiving network, and those costs are passed through to you either as per-minute rates or bundled into an inclusive minutes plan.

UK Landline Call Rates

Calls to UK geographic numbers (01 and 02 prefixes) are the cheapest off-net call type. Typical VoIP rates for UK landline calls are:

• Per-minute rate: 0.5p to 2p per minute on pay-as-you-go plans
• Inclusive plans: Often bundled at no extra cost — many providers include unlimited UK landline calls in their standard per-user fee
• Connection fee: Some providers charge a small connection or setup fee of 1p to 3p per call in addition to the per-minute rate

If your team makes a high volume of calls to landlines — sales teams, for example — an inclusive plan almost always works out cheaper than paying per minute.

UK Mobile Call Rates

Calls to UK mobile numbers (07 prefix) are more expensive because mobile network operators charge higher termination rates. Typical VoIP rates include:

• Per-minute rate: 3p to 8p per minute on pay-as-you-go
• Inclusive plans: Many mid-tier and premium VoIP packages bundle UK mobile minutes alongside landline minutes, though the allowance may be capped separately
• Peak vs off-peak: Unlike legacy carriers, most VoIP providers charge a flat rate regardless of time of day, simplifying budgeting

The gap between landline and mobile call rates is the single biggest variable on a VoIP bill. If more than half your outbound calls go to mobiles, make sure your plan reflects that.

International Call Rates

International rates vary enormously depending on the destination country and whether you are calling a landline or mobile number in that country. Here is a general guide:

Destination	Landline (per min)	Mobile (per min)
USA / Canada	0.5p – 1.5p	0.5p – 2p
Western Europe (France, Germany, Spain)	1p – 3p	3p – 8p
Australia / New Zealand	1p – 4p	5p – 12p
India	2p – 5p	2p – 6p
South Africa	3p – 8p	8p – 18p
Middle East (UAE, Saudi Arabia)	5p – 15p	10p – 30p

These rates are indicative and can change frequently. Always request a current rate card from your provider for the specific countries your business calls regularly.

International Bundles

If your business makes regular calls to specific countries, many providers offer international bolt-on bundles — for example 500 minutes to US and Canadian numbers for a fixed monthly fee. These bundles can slash your costs by 50 percent or more compared with pay-as-you-go rates.

Special Number Charges

Certain UK number ranges carry premium or non-standard charges that apply regardless of your call plan:

1. 0800 / 0808 (freephone) — Free for the caller. If you own a freephone number, you pay an inbound per-minute rate (typically 2p–5p per minute).
2. 084 / 087 numbers — Service charges apply on top of access charges. These calls are often excluded from inclusive bundles.
3. 09 numbers (premium rate) — Charged at high rates, usually passed through at cost. Many businesses block these at the PBX level to prevent bill shock.
4. 118 (directory enquiries) — Extremely expensive; individual calls can cost several pounds. Consider blocking these too.
5. 03 numbers — Charged at the same rate as 01/02 geographic calls and usually included in bundles.

What Affects Your Per-Minute Rate

Several factors determine the exact rate your provider charges you:

• Termination costs — The fee paid to the network receiving the call. Ofcom regulates some of these, but mobile termination rates are higher than fixed.
• Provider margin — The markup your VoIP provider adds. This varies significantly between providers and is the main lever for negotiation.
• Volume commitments — Higher call volumes often unlock lower per-minute rates. If your usage has grown, ask for a rate review.
• Contract length — Longer contracts sometimes come with discounted call rates, though you trade flexibility for savings.
• Billing increment — Some providers bill in 60-second increments, others in one-second increments. A 10-second call billed at 60-second increments costs six times more than it should.

Always ask about billing increments — it is one of the most overlooked details and can have a material impact on your monthly bill.

How to Compare Call Charges Between Providers

When evaluating VoIP providers, follow this process to get an accurate comparison:

1. Pull three months of call-detail records from your current provider.
2. Categorise calls by type: UK landline, UK mobile, international by country, special numbers.
3. Calculate your total minutes and spend in each category.
4. Request itemised quotes from shortlisted VoIP providers based on your actual usage profile.
5. Factor in per-user charges, not just call rates — a provider with slightly higher call rates but lower seat fees may be cheaper overall.

Our comprehensive breakdown of VoIP costs for small businesses in the UK walks through this process with real-world pricing examples.

Monitoring and Controlling Call Costs

Once your VoIP system is live, ongoing monitoring is essential to prevent cost creep:

• Set up spend alerts — Most platforms allow you to configure email alerts when a user or department exceeds a spending threshold.
• Block premium numbers — Use call-barring rules to prevent calls to 09, 118 and other high-cost prefixes.
• Review CDRs monthly — Call-detail records reveal usage patterns. Look for anomalies that might indicate toll fraud or misuse.
• Renegotiate annually — Call termination rates change and the VoIP market is competitive. An annual rate review with your provider costs nothing and often yields savings.

VoIP call charges are more transparent and more controllable than traditional telephony — but only if you take the time to understand the structure and review your usage regularly.