Are Virtual Phone Numbers Reliable for Business Use?

It's a fair question. If you're putting a phone number on your website, business cards, and Google listing, you need to know it will work every time a customer calls. The short answer is yes — virtual phone numbers are reliable for business use, and in many cases more reliable than the traditional copper landlines they're replacing.

But "reliable" means different things to different people. Let's break it down: call quality, uptime, what happens when things go wrong, and how virtual numbers compare to the ageing PSTN network that's being switched off on 31 January 2027 — now just weeks away, with Openreach confirming “there is no extension to the deadline”^[1].

Call Quality: Can Callers Tell the Difference?

No. Modern virtual phone numbers use Voice over Internet Protocol (VoIP) technology to route calls, and call quality on today's VoIP platforms is identical to a traditional landline. The caller hears a standard UK ringtone, the conversation sounds completely normal, and there's no echo, delay, or robotic quality.

This wasn't always the case. Early VoIP in the 2000s suffered from poor audio, dropped calls, and noticeable delays. But the technology has matured dramatically. Faster broadband, better audio codecs, and carrier-grade networks mean internet-routed calls are now the norm rather than the exception — the entire UK phone network is moving onto this technology as the PSTN closes.

There's also an important distinction to understand about how calls reach your phone:

With a call-forwarding service like Virtually Local, the call reaches your mobile through the normal mobile network — exactly the same way any other phone call does. Your internet connection isn't involved in the call itself. If you can receive a normal phone call, you can receive a forwarded virtual number call with identical quality.

Uptime: How Often Does It Actually Work?

Uptime is about how the service is built, not just how it's marketed. Rather than relying on headline percentages, look at whether a provider runs its platform across more than one data centre, whether calls can fail over automatically, and what you can do yourself if your own phone or signal has a problem. Those design choices are what keep calls flowing day to day.

The cloud infrastructure behind virtual numbers is built with redundancy. If one server fails, calls are automatically routed through another. This is fundamentally different from a traditional landline, where a single fault on your copper line — water ingress, a damaged cable, an exchange failure — takes your entire phone service offline until an engineer can attend.

The Copper Network Is Getting Less Reliable, Not More

There's an assumption that traditional landlines are inherently more reliable than anything internet-based. That may have been true 20 years ago. It isn't today.

The copper PSTN network is decades old, and keeping it running has become harder. Ofcom’s Connected Nations 2024 report recorded a 45% rise in significant PSTN resilience incidents^[3], and BT used those figures to argue for withdrawing the copper network faster.

The reasons are straightforward: the equipment is ageing, spare parts for old exchange kit are harder to source, and the industry’s investment is going into the digital network that replaces it. Customers are moving too — Ofcom’s market data shows UK fixed lines fell by 522,000 in a single quarter to 20.2 million in Q2 2026^[4], and calls made from landlines are falling year on year.

The copper network isn't just less reliable — it's being permanently retired. Any business still relying on a traditional PSTN landline will need to migrate to an internet-based alternative before 31 January 2027. Openreach figures reported in October 2026^[2] show that around 300,000 business premises still hadn't made the switch. If that includes you, our PSTN switch-off checklist for the final 12 weeks sets out what to do now.

What Happens If Something Goes Wrong?

Every phone system can have problems. The difference is how quickly you can recover. With a traditional landline, a fault means calling BT, waiting for an engineer, and potentially being without a phone for days. You can't do anything yourself to fix it.

With a virtual number, you have options:

The key advantage is control. You can respond to problems yourself, immediately, through an online portal. There's no call to a help desk, no waiting window, and no dependence on a single physical line.

Are Virtual Numbers Legitimate?

Yes. Virtual phone numbers are genuine UK telephone numbers allocated by Ofcom from the same number ranges as traditional landlines. A geographic virtual number starting with 01 or 02 is indistinguishable from a landline installed by BT or any other provider. It's the same type of number, issued under the same regulatory framework.

Ofcom regulations also protect your rights as a virtual number user:

• Number portability — You have the legal right to take your number with you if you switch providers. Under General Condition B3 of the Communications Act 2003, providers cannot refuse a porting request.
• Your number is yours — Whether you've had it for a week or a decade, you own the right to use and port that number.
• Free porting — With Virtually Local, porting your existing number in is free, and most ports complete within around a week. Your old number keeps working until the moment it switches over.

This means you're not locked in. If you ever want to move your virtual number to a different provider — or even to a traditional landline — you can. The number stays with you.

Does My Broadband Matter?

This depends on how your virtual number delivers calls. If you're using a call forwarding service (which is how Virtually Local works), your broadband doesn't matter at all for the calls themselves. Calls are forwarded to your mobile through the standard phone network. You manage your settings through a web portal, but the calls travel over the mobile network just like any other phone call.

If you're using a VoIP app that routes calls over your internet connection, then yes, your broadband quality matters. You need a stable connection with low latency and minimal packet loss. The good news is that UK broadband has improved significantly as full-fibre and gigabit-capable networks have rolled out, but a VoIP app is still only as good as the Wi-Fi or mobile data it’s running on at that moment.

But for most small businesses and sole traders, call forwarding is the simpler and more reliable approach. It removes broadband quality from the equation entirely. For more on this distinction, see our article on using a virtual phone number on your mobile.

A Quick Reliability Checklist Before You Choose a Provider

Whichever virtual number provider you’re considering, these questions tell you far more about real-world reliability than any headline figure:

• How are calls delivered? Call forwarding to your mobile over the normal phone network removes your broadband from the picture. App-only services depend on your data connection.
• Can you change routing yourself, instantly? An online portal that lets you redirect calls in seconds is your best protection against a lost phone, a flat battery, or a dead spot.
• Is there a fallback when nobody answers? Voicemail to email and missed call alerts mean a failed connection still becomes a message or a call-back.
• Can more than one person answer? Hunt groups remove the single point of failure that comes with one phone and one person.
• Is your number really yours? Check the provider uses genuine Ofcom-allocated UK numbers and supports porting in and out.
• Are you tied in? Monthly rolling terms mean a provider has to keep earning your business. Virtually Local starts from £4.95 per month with no long contract.

Test the service before you print the number: call it from a mobile and a landline, try it at different times of day, and check how voicemail and alerts arrive. If you’re new to how it all works, our guide to what a virtual phone number is and how it works covers the basics.

The Bottom Line

Virtual phone numbers are not just reliable enough for business use — they're increasingly more reliable than the traditional copper landlines they're replacing. The PSTN network is ageing and being retired, while modern virtual number platforms are built on redundant cloud infrastructure with automatic failover.

With a call-forwarding service, call quality is identical to any normal phone call. You're not dependent on your broadband. And when something does go wrong, you can fix it yourself in seconds rather than waiting days for an engineer.

The copper network is being switched off on 31 January 2027 regardless — and that date is now only weeks away. Virtual numbers already use the technology that everything is moving to. The question isn't whether they're reliable enough — it's whether the alternative still is.