You're probably reading this because you need calls to reach the right person today, not after a long hunt through phone menus. Maybe you're leaving the office for a client meeting, working from home for the afternoon, or trying to stop calls piling up on a mobile that nobody is watching. In a small business, a missed call isn't just an inconvenience. It can be a new enquiry, an existing customer, or a supplier trying to confirm something urgent.
Call forwarding sounds simple, and in one sense it is. You send calls from one number to another. The trouble starts when people switch it on, assume it's sorted, and never check it again. That's where businesses lose calls, often going undetected. A phone can keep forwarding long after the original reason has gone, and the problem often comes to light only when customers start saying, “I've been trying to reach you.”
Table of Contents
- Why Call Forwarding Is a Business Essential
- Conditional vs Unconditional Forwarding Explained
- Setting Up Call Forwarding on Mobile Devices
- Configuring Call Diversion for UK Landlines and VoIP
- Testing Troubleshooting and Security Best Practices
- Using Call Forwarding for Business Continuity
Why Call Forwarding Is a Business Essential
If you run a business in Essex or London, you won't always be sat beside the same handset. You're in and out of the office, taking site visits, speaking with customers, chasing suppliers, and dealing with the day getting away from you. Call forwarding keeps your number working even when you're not where the phone is.
That matters because callers rarely wait around. If they hit voicemail too early, or get no answer at all, they often move on to the next company. For a small business, that's avoidable.
According to EE's guide to managing call diverts, UK business users can use several types of diversion, including unconditional forwarding, no-answer, busy, and not-reachable. The same guidance also notes that setting a divert to voicemail is free for EE Small Business customers. That makes call forwarding one of the easiest continuity tools to put in place without a major system change.
Where it helps most
- When you're out of the office: Calls can follow you to a mobile or colleague instead of ringing out on a desk phone.
- When one person is overloaded: Busy forwarding stops a second caller hitting a dead end while you're already on another call.
- When signal or power becomes a problem: Not-reachable forwarding gives you a fallback if a device is off or disconnected.
- When the business needs a more flexible front door: If you're reviewing broader options to boost operations with virtual numbers, call routing becomes part of a wider communications setup rather than a one-off phone setting.
Practical rule: Forwarding works best when you treat it as part of customer service, not just a phone feature.
What good setup looks like
A good setup matches the way your business operates. If you're away all day, forwarding every call might make sense. If you only need cover when you can't pick up, a conditional rule is usually better. The right choice depends on who answers, when they answer, and what should happen if they miss it too.
Most problems I see aren't caused by the feature itself. They happen because nobody decided in advance where calls should go, who owns the setting, and when it should be switched off again.
Conditional vs Unconditional Forwarding Explained
Before you change anything, decide what kind of divert you need. Most confusion stems from this. People turn on forwarding for one short-term reason, then realise too late that every call has been bypassing the main number ever since.
Unconditional forwarding sends every incoming call straight to another number. Your original phone doesn't ring.
Conditional forwarding only sends calls on under certain conditions, such as when you don't answer, when you're already on a call, or when the phone isn't reachable.
Unconditional vs Conditional Call Forwarding
| Feature | Unconditional Forwarding | Conditional Forwarding |
|---|---|---|
| What it does | Sends all calls straight to another number | Sends calls only when a trigger applies |
| Best use | Holidays, office closure, training days, planned absence | Day-to-day cover when you still want to answer normally |
| Does the original phone ring | No | Usually yes, unless the condition is already met |
| Risk if left on too long | High, because every call bypasses the original number | Lower, but still worth checking regularly |
| Typical examples | Forward all calls to reception or a mobile | Forward only if busy, unanswered, or unreachable |
When unconditional forwarding is the better fit
This option is clean and predictable. If the office is shut for a bank holiday, if a member of staff is away for the week, or if a department is temporarily moved, routing every call elsewhere avoids guesswork.
It's also useful when you don't want calls hitting an unattended device at all. In that case, the customer gets a live route immediately rather than waiting through rings that nobody will answer.
If you know in advance that nobody should answer the original phone, unconditional forwarding is usually the least messy option.
When conditional forwarding is smarter
This is the better choice for most owner-managed firms. Your main number still works normally, but you have cover when something gets missed. Calls can roll over if you're engaged, if you don't answer in time, or if the device drops off the network.
That gives you a softer handover. You still get the first chance to answer, but customers aren't left stuck if you can't.
A simple way to choose
Use this quick test:
- Pick unconditional forwarding if the original phone should not take calls at all for a period.
- Pick conditional forwarding if the original phone should still ring first.
- Avoid using forwarding without an end point in mind. If the destination number doesn't have voicemail, cover, or a named owner, you're only moving the problem elsewhere.
The wrong setup isn't usually a technical failure. It's a decision failure. Choose the rule based on how your business answers calls in real life, not how you hope it works on a quiet day.
Setting Up Call Forwarding on Mobile Devices
For most small businesses, the mobile is the primary business line even if the number started life on a desk phone. That means you need a method that's quick, easy to check, and easy to reverse when plans change.
The rule that catches people out
There's one UK limitation you need to know before you start. Standard mobile call forwarding is set up on the handset itself, and UK providers restrict normal mobile forwarding to UK numbers only. Three's community support states, “You can only call forward to UK numbers,” and EE Business says these diverts must be set up on your phone rather than remotely by customer service, as shown in Three's call forwarding discussion.
So if you're trying to send calls from a UK mobile to an overseas number, don't keep troubleshooting the menu. On a standard setup, that isn't the route.
How to set it up on iPhone
On an iPhone, the cleanest method is through Settings.
- Open Settings.
- Tap Phone.
- Tap Call Forwarding.
- Switch Call Forwarding on.
- Tap Forward To.
- Enter the destination UK number.
That's usually the simplest route for unconditional forwarding. If you're forwarding to another mobile, enter the number carefully and double-check the digits before backing out of the screen.
A common mistake is doing the setup in a hurry and missing one digit. The phone won't always make that obvious until someone tries to call you.
How to set it up on Android
Android varies by manufacturer and network, so the wording isn't always identical. The normal route is through the Phone app rather than the main system settings.
- Open the Phone app.
- Tap the menu icon.
- Go to Settings.
- Look for Call Forwarding or Supplementary Services.
- Choose the divert type you want.
- Enter the destination number and confirm.
You'll often see separate options for always forward, when busy, when unanswered, and when unreachable. That's useful because Android tends to expose more of the conditional options directly in the menu.
Using star codes on UK mobiles
If the menu is buried or the handset interface is awkward, star codes can be faster. The commonly used UK codes include:
- Always forward:
**21*[Phone Number]# - No reply:
**61*[Phone Number]# - Not reachable:
**62*[Phone Number]# - Cancel and keep for future use:
##21# - Re-establish a stored setting:
*21#
These are handy when you need to make a quick change from the keypad. They're less handy when someone forgets the exact format.
A short walkthrough can help if you prefer seeing the menu path in action:
What works better in practice
For one-off changes, the handset menu is usually safer because you can see the setting you're changing. Star codes are quicker once you know them, but they leave more room for typing errors and less room for confidence.
If you're learning how to set up call forwarding for the first time, use the menu first. Once you know how your handset behaves, use codes for speed.
Configuring Call Diversion for UK Landlines and VoIP
Mobiles get most of the attention, but plenty of firms still rely on a main office number. If that number is printed on your vans, website, invoices, and email signatures, it needs proper handling. A landline or hosted phone system often remains the front door to the business, even when staff are moving around.
Landlines still matter
Traditional landline diverts are usually activated with keypad codes supplied by the provider. You pick up the handset, enter the code, add the destination number, and wait for confirmation. The exact code can vary by provider and service, so the safest move is to check the current instructions for your line before changing anything.
The basic principle is still straightforward. You're telling the network what to do with incoming calls when the main line isn't the right endpoint.
For a small office, landline forwarding is useful in situations like these:
- Office closed for the day: Route calls to a duty mobile or answering point.
- Reception unmanned: Send calls to another desk after a short delay.
- Temporary move or refurb: Keep the public number live while staff work elsewhere.
A business number only helps if it still reaches someone. Customers don't care whether the call lands on a wall phone, a mobile, or a softphone. They care that somebody answers.
Why VoIP is easier to manage
This is where modern hosted telephony wins. With VoIP platforms, call forwarding usually sits inside a web dashboard or admin portal rather than depending on star codes that somebody scribbled on a Post-it note months ago.
That gives you better control. You can often change routing from a browser, assign rules to users or groups, and decide what happens after a set number of rings. You also avoid the problem of one person changing a handset setting that nobody else can see.
Common dashboard options include:
- Immediate divert: Send calls straight to another user, mobile, or voicemail.
- Ring then forward: Let one device ring first, then pass the call on.
- Time-based routing: Send calls one way in office hours and another way after hours.
- Group handling: Present the same call to more than one person, then fall back to voicemail.
A practical setup for a small office
A sensible small-business arrangement often looks like this:
- Calls hit the main office number.
- The receptionist or primary user gets the first chance to answer.
- If unanswered, the call goes to a second person or team mobile.
- If that still isn't answered, voicemail takes the call with a proper business greeting.
That chain is much easier to manage in VoIP than on older lines. It's also easier to update when staff change roles, work remotely, or cover annual leave. For firms with a mix of office and mobile working, dashboard-based call handling is usually more reliable than relying on each person to remember their own divert settings.
Testing Troubleshooting and Security Best Practices
This is the part most guides skip, and it's the part that causes the most grief later. Setting a divert is only half the job. You also need to confirm it works, check that it's still the right rule, and remove it when it's no longer needed.
The danger is the set it and forget it habit. A forwarding rule gets enabled for a holiday, a sick day, or a temporary cover arrangement. Weeks later, calls are still going elsewhere. According to a 2025 review of UK call-divert guidance, only 12% of UK call-forwarding tutorials include deactivation steps, and a Networking2000 internal client survey found 34% of UK small businesses in Essex and London reported accidental call loss due to forgotten forwards.
Why set it and forget it causes problems
Forwarding failures aren't always dramatic. Often the phone is doing exactly what it was told to do, just long after the original reason has gone. That makes the fault harder to spot.
A customer rings your published number. The call gets forwarded to an old mobile, an ex-staff member's extension, or a voicemail nobody monitors. From the caller's point of view, they reached you. From your point of view, the enquiry vanished.
Check forwarding the same way you'd check alarm codes or door access. It's a small admin task with a big downside if ignored.
A simple post-setup check routine
Use this routine every time you make a change:
- Place a live test call from another line straight after setup.
- Confirm the destination answers and that the audio is clear.
- Check active forwarding status with
*#21#if your service supports it. - Record what you changed in a simple note, shared password vault, or admin log.
- Set a reminder to review or switch it off after the reason for forwarding has passed.
If you need to remove a divert completely, many services use codes such as #21# or *#21# for checking status and deactivation. Always verify with a second test call after making the change.
Common faults and what usually fixes them
Some issues come up again and again:
- Wrong destination number: Re-enter the number slowly and confirm it's a UK number in the correct format.
- Wrong forwarding type selected: “Always forward” behaves very differently from “when unanswered”.
- Old rules left active: Check status before adding a new rule, especially if someone else used the handset previously.
- Confusing Android menus: Some devices hide forwarding under call settings or supplementary services rather than the main settings app.
- No test call after setup: Failing to conduct a test call allows most avoidable mistakes to slip through.
A security habit worth keeping
Treat call forwarding like any other access-related setting. If staff leave, roles change, or company mobiles are replaced, review the rules. The same applies after office moves, broadband changes, or phone-system maintenance.
A quick monthly audit is enough for many small firms. The point isn't to make it complicated. It's to stop a forgotten divert intercepting customer calls for months.
Using Call Forwarding for Business Continuity
Used properly, call forwarding becomes part of your continuity plan rather than a quick fix. It gives you options when people are away, buildings are shut, internet links fail, or one person suddenly becomes the bottleneck for every incoming call.
Best-fit setups for common business situations
Different scenarios need different rules.
- Holiday cover: Use unconditional forwarding if nobody should answer the usual device at all.
- Out-of-hours support: Use a planned route from the main number to the on-call mobile or answering team.
- Busy owner-manager: Use conditional forwarding so the phone still rings you first, then passes calls on if you can't answer.
- Temporary office disruption: Route the main number to staff mobiles or a hosted system until the site is fully working again.
For trades and urgent service businesses, response time matters even more. If you handle reactive jobs, a specialist workflow for handling emergency HVAC service calls shows how after-hours call handling can be structured so urgent callers don't stall at voicemail.
Build a fallback before you need it
The best continuity setups are decided while everything is working normally. Choose where the main number goes if the office is empty. Decide who owns after-hours cover. Make sure voicemail greetings match the routing. Keep a short written record of the current arrangement.
That turns forwarding from a scramble into a process. When there's a power issue, staff absence, office move, or sudden spike in calls, you already know what happens next.
Call forwarding won't fix poor call handling on its own. It will, however, stop a lot of avoidable call loss if the route is sensible, tested, and reviewed.
If you need help getting your business numbers, VoIP routing, landlines, mobiles, or failover call handling set up properly, Networking2000 can help across Essex and London with practical, jargon-free support.
