Switching Business Telecoms Provider

What actually happens when you change supplier: whether you keep your number (you do), how long it takes, what the notice period traps are, and the handful of things that genuinely go wrong.

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Nobody switches because they enjoy it

Last updated 11 August 2026

People stay with a telecoms supplier long past the point of it making sense, and the reason is almost never loyalty. It is that switching sounds like it involves losing your number, going dark for a day, and discovering afterwards that something you depended on has stopped working. Those fears are reasonable — they are just mostly out of date. Numbers port, the cutover is measured in minutes rather than days, and the things that break are predictable enough to check for in advance.

The genuinely awkward part is not technical, it is contractual. Business telecoms contracts renew automatically far more often than people expect, notice periods of 30 to 90 days are normal, and a great many businesses discover they have rolled into another year at the exact moment they decide to leave. That is worth checking before anything else, because it changes when you can move rather than whether you can.

The second awkward part is knowing what you actually have. Most businesses cannot produce a list of their own lines, and the forgotten ones — an alarm dialler, a lift phone, a card terminal, a line into an office nobody uses any more — are what turn a simple switch into an incident. Any decent supplier should audit that before quoting, and you should be suspicious of one that does not ask.

What actually happens, in order

1. Find out what you have

Every line, including the ones with nothing obviously plugged in. Bills and a walk round the building. This is where surprises are found cheaply rather than expensively.

2. Check your notice period

Contract end date and notice period, in writing. This decides your timeline. Serving notice late is the single most common reason a switch slips a year.

3. Numbers are ported, not replaced

Your existing numbers move across. Nothing on your signage, vehicles, website or stationery has to change, which is the fear that stops most people.

4. The cutover

Usually a scheduled morning, often minutes of actual disruption. Calls route to mobiles during it if you cannot afford any gap at all.

5. The forgotten connections

Alarms, lifts, card terminals, door entry. Migrated deliberately rather than discovered when one fails, which is the part that goes wrong.

6. Afterwards

Old service ceased so you stop being billed twice, and a named person to ring rather than a queue. Double billing after a switch is common and avoidable.

Who we work with

We are independent of any single network or vendor, so the recommendation follows the requirement.

Telephony platforms

Hosted, on-premise or Microsoft Teams — the right answer depends on the building, not on what we prefer to sell.

Network and vendor names and logos are the trademarks of their respective owners, shown to describe the services SCG Solutions supplies.

The things that actually go wrong

Notice served too late, so the contract rolls into another year — check this first, before anything else
A line nobody knew about carrying an alarm or a lift phone, found when it stops working
The old service left running, so you pay two suppliers for months
A number missed from the port list because it was billed separately
Broadband and phone tangled in one contract, so leaving one means leaving both
Nobody told the people who answer the phones, so the cutover happens mid-morning with a full queue

Switching Business Telecoms Provider — Common Questions

Will I lose my phone number if I switch provider?

No. Numbers are ported to the new supplier rather than replaced, so the number that is on your signage, your vehicles and every business card you have ever handed out stays exactly the same. This is the single most common worry about switching and it is the easiest one to settle — you keep the number, you change what carries it.

How long does business number porting take?

For a simple single line, commonly around ten working days from the point the paperwork is right. For a larger estate with multiple numbers, several sites or a phone system involved, plan on a few weeks — mostly for checking and scheduling rather than the work itself. The date is agreed in advance rather than sprung on you.

How much downtime is there when switching?

Usually minutes rather than hours, on a morning you choose. Where a business genuinely cannot afford any gap — a booking line, a support desk — calls divert to mobiles across the cutover so nothing is missed. The one thing worth avoiding is scheduling it for your busiest hour, which happens more often than it should.

What is the notice period on a business telecoms contract?

Commonly 30 to 90 days, and many contracts renew automatically if notice is not served. This is the thing to check before anything else, because it decides when you can move rather than whether you can. It is also the reason a lot of businesses end up staying another year by accident.

Can I switch if I am mid-contract?

You can, but there is usually an early termination charge, and whether it is worth paying depends entirely on the numbers. Sometimes a new supplier will absorb some of it; sometimes the sensible answer is to serve notice properly and move at the end of the term. We will tell you which of those applies rather than assuming you want to move today.

What happens to my alarm, lift phone or card machine?

They get migrated deliberately, which means finding them first. These are the connections that get forgotten because nobody thinks of them as phones, and they are the ones that cause a problem after a switch. Any supplier quoting without asking about them has not audited the site properly.

Want to know where you actually stand?

Send us a recent bill. We will tell you what you are paying for, what your notice position looks like, and whether switching is worth it — including when the answer is that you are already on a fair deal and should stay put.

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