Microsoft Teams Calling Plans | What Are They and What Do They Cost?

A Calling Plan sits on top of a Teams Phone licence — it does not replace it. The Teams Phone licence switches on the cloud PBX features (auto-attendant, call queues, voicemail). The Calling Plan, or an alternative connection method, provides the actual line to the outside world. Most UK businesses we onboard onto business VoIP get this distinction wrong on the first quote, so it is worth nailing early.

If you want the wider picture of running phones inside Teams, read our guide to Microsoft Teams Calling alongside this page.

What Does a Microsoft Teams Calling Plan Actually Include?

A Calling Plan bundles three things: a UK phone number, a pooled or per-user minute allowance, and the carrier connection that routes calls to and from the public phone network. It is bought per user, per month, and is billed by Microsoft directly inside your Microsoft 365 tenant.

The Teams Phone licence alone gives you internal calling and PBX logic but no external line. Without a Calling Plan (or Direct Routing or Operator Connect), a user cannot dial a normal phone number or receive one. That is the single most common deployment mistake — buying Teams Phone and assuming external calling is included.

• A UK phone number — new, or ported from your existing provider.
• Inclusive call minutes — typically 120–1,200 minutes per user per month depending on tier, based on Microsoft's 2026 plan structures.
• PSTN carriage — the actual connection to the public phone network, managed by Microsoft.
• Per-minute charging beyond the inclusive allowance.

What Types of Microsoft Calling Plan Are There?

Microsoft offers three commercial shapes of Calling Plan: a Domestic plan, a Domestic and International plan, and Pay-As-You-Go. The right one depends almost entirely on how many minutes your team actually burns and where they call. Measure before you buy — guessing tier is how businesses overspend.

Domestic Calling Plan

The standard choice for UK-only businesses. It provides a UK number and inclusive minutes for calls within the UK, priced from £5.95 per user per month depending on the minute tier. Calls beyond the allowance are charged per minute, so heavy callers should size the tier carefully.

Domestic and International Calling Plan

Adds international minutes on top of the domestic allowance. It suits teams making regular overseas calls — but included international minutes and per-minute rates vary sharply by destination. Model your real call destinations against the rate card before committing, because international Calling Plan rates are rarely the cheapest route.

Pay-As-You-Go Calling

No inclusive minutes — every call is charged at Microsoft's per-minute rate. This only makes sense for predominantly inbound users who make very few outbound calls. For anyone dialling out daily, a bundled plan or Direct Routing almost always works out cheaper.

Calling Plans vs Operator Connect vs Direct Routing — Which Connects Teams to the Phone Network?

Calling Plans are only one of three ways to connect Teams Phone to the PSTN. Operator Connect lets you pick a Microsoft-certified carrier through the Teams admin centre, and Direct Routing uses a Session Border Controller to connect any SIP carrier you like. Each trades simplicity against cost and flexibility.

Microsoft Calling Plans

Microsoft supplies the numbers, minutes and carriage directly, all managed in the Microsoft 365 admin portal. It is the simplest model and the fastest to switch on — ideal for smaller teams that want minimum moving parts. The trade-off is limited control over call rates and number management.

Operator Connect

A Microsoft-certified carrier connects its SIP network to Teams Phone through Microsoft's managed cloud — no SBC to run. You choose from certified carriers (BT, Gamma, TELE2 and others), with numbers and billing coming from that carrier. It often beats Microsoft's own Calling Plan rates while keeping setup light.

Direct Routing

A certified SBC connects Teams Phone to any SIP carrier you want. This gives the most flexibility — keep existing carrier contracts, use a SIP trunk provider of your choice, and typically pay lower per-minute rates. It needs SBC infrastructure and more configuration, so it earns its keep at higher call volumes or across complex multi-site estates.

Microsoft documents all three connectivity routes in its official Teams Phone PSTN connectivity guidance, which is worth reading before you commit to a model.

What Should You Watch Out For With Microsoft Calling Plans?

Before signing up for Calling Plans, check four things: minute allowances, international rates, emergency calling configuration, and porting timescales. Each is a common source of either surprise cost or a compliance gap, and all four are straightforward to get right at the design stage rather than after go-live.

• Minute allowances — base tiers may not cover heavy phone users. Calculate expected monthly minutes per user before choosing a tier.
• International calling — Microsoft's international per-minute rates can run high. For regular overseas calling, compare total cost against Direct Routing with a competitive SIP carrier.
• Emergency calling — Teams Phone must carry correct emergency location information. UK PSTN regulatory requirements, overseen by Ofcom, apply to Teams calls exactly as they do to any phone system.
• Number porting timescales — porting existing UK numbers to Microsoft typically takes 10–15 working days (typical UK 2026 timescale), a little longer than some Direct Routing providers.

This is where a hosted phone system review pays off: getting tier sizing and emergency calling right at design stage avoids re-work after go-live.

How Big Is Teams Phone Now?

Microsoft Teams Phone has become one of the largest cloud PBX platforms in the world — strong evidence that Teams-native calling is now a mainstream business phone choice, not a side feature.

For context, an estimated 80 million Teams users have some calling capability enabled, but only a fraction — around 6.25% — have external PSTN calling switched on. That gap is the opportunity: most organisations already own the licensing foundation and simply have not connected Teams to the phone network yet. Microsoft's own Microsoft 365 product information is the authoritative place to confirm current licensing and plan structures.

If your tenant already runs Microsoft 365, layering calling on top is usually quicker than migrating to a separate phone platform — see our notes on VoIP with Microsoft 365.