How to Route Calls to Mobiles: Diverts and Smart Forwarding

You can route calls to a mobile in minutes. Dial a star code on your landline, or switch on call forwarding in your phone's settings, and your business number rings wherever you are. That solves the first problem. It does not solve the second: what happens when you are on a roof, under a car or with a client, and your mobile rings out anyway. This guide covers both. First the exact steps and costs of a basic divert, then the smarter options that stop missed calls turning into lost jobs.

TL;DR

• Basic forwarding is quick: on most UK landlines, dial 21, the mobile number and # to divert every call. Your provider's help page confirms the exact codes.
• Choose the right type: unconditional diverts send everything; conditional diverts only act when you are busy, unanswered or unreachable.
• Watch the bill: the diverted leg is charged at your plan's call rate, so a divert to a mobile can use up your allowance or cost extra.
• Plain forwarding has limits: one destination, no queue, no reporting. If you still miss calls, you need a system that answers, qualifies and books for you.

Table of Contents

• What it means to route business calls to a mobile
• Forwarding from a UK landline or business number
• Forwarding on an iPhone or Android phone
• Unconditional or conditional: which should you use?
• What forwarding costs in the UK
• Caller ID, voicemail and unanswered calls
• Check it is working, and turn it off
• A security warning about star codes
• Where basic forwarding falls short
• Smart call forwarding: rules instead of a single divert
• Our perspective: forwarding moves the problem, it does not solve it
• Where Talk2Aiva fits alongside your mobile
• Choosing the right setup for your business
• Common mistakes when routing calls to mobiles
• FAQ
• Sources

What it means to route business calls to a mobile

Routing calls to a mobile means that when someone dials your business number, the call rings on a different phone. In the UK this is usually called a call divert or call forwarding. EE describes it as a way to divert calls from your phone to another number in the UK.

There are three common ways to do it:

1. Divert from the line itself. You tell your landline or mobile provider to send calls elsewhere. The caller dials your number and the network does the rest.
2. Forward from the handset. You switch on forwarding in the settings of your iPhone or Android phone.
3. Use a system that sits in front of your number. Calls land in software first, which applies rules and then rings the right person, or answers for you.

The first two are free to set up with most providers. The third is where "smart call forwarding" comes in, and we come to it later.

Forwarding from a UK landline or business number

On BT and most UK landlines, forwarding runs on star codes. According to this UK guide to diverting calls, the usual codes are:

Type the code on the handset, then replace "number" with the full mobile number, and finish with #. Some providers need call diversion enabled on your account first, so if the code does nothing, ring your provider.

Virgin Media is different. Customers must work out their area colour by calling 1765 before activating Call Divert, because codes vary by region, with some areas using 21 and others *70. If you are on Virgin Media, follow their page rather than a generic code list.

A quick routine for setting it up

1. Check which provider and which type of line you have.
2. Confirm the divert code on your provider's help page.
3. Enter the code and the mobile number, ending with #.
4. Ring your business number from a different phone to test it.
5. Check the mobile shows the call and that you can answer it.

Test it every time you change anything. A divert pointed at a mistyped number is a silent way to lose enquiries.

Forwarding on an iPhone or Android phone

If the business number is itself a mobile, you can forward from the handset.

iPhone: Apple's UK guide says to go to Settings, then Apps, then Phone, then Call Forwarding, and switch it on. Apple adds that for conditional forwarding you should contact your carrier for setup information.

Android: open the Phone app, choose Menu, then Settings or Call Settings, then Call Forwarding. Select an option and enter the number, as EE's business help page explains. Menu names vary by make and software version, so you may find it under Calls or Supplementary Services.

Whichever phone you use, pick the type of forwarding carefully. That choice matters more than the menu path.

Unconditional or conditional: which should you use?

EE explains the difference simply. Unconditional diverts send all calls on without your phone ringing. Conditional diverts only send calls on when your phone is busy or there is no answer.

Here is how that plays out in a working day:

• Unconditional suits a day when you are away from the desk or shop and the mobile is your only phone. Everything goes to one place.
• Conditional (no answer) suits a business where someone usually picks up, but cover is needed when they cannot. The call rings the main phone first and only moves on if nobody answers.
• Conditional (busy) suits a single line that is often engaged. The second caller goes to your mobile instead of getting an engaged tone.

One company that sells business phone systems advises conditional forwarding because it gives you better control of the caller's experience than sending everything everywhere. For most small service businesses, that is sensible. Use the unconditional option when you have a reason, not by default.

What forwarding costs in the UK

Forwarding is not free just because the setup is. The forwarded call is a second call, and someone pays for it: you.

EE states that diverting a call to another UK number is charged at your plan's call rate. If the destination is included in your allowance, the divert uses that allowance. If you exceed it, or divert to a number your plan does not include, such as an 08 number, normal charges apply.

The pattern is the same elsewhere. A UK guide notes that providers typically charge the forwarded leg as an outbound call from your landline or main number to the destination mobile. It calls this the hidden cost, and it catches people out.

What to do about it:

• Look at your landline tariff for calls to mobiles before you switch forwarding on.
• Check how many minutes your mobile plan includes for incoming calls and for calls from your provider.
• Review one month of bills after setting it up. Do not assume.
• If you divert all day, every day, compare the cost with a system that handles calls without needing a second leg to your mobile.

Caller ID, voicemail and unanswered calls

The awkward moments with forwarding come when the call does not get answered.

Voicemail. On Virgin Media landlines, setting up Call Divert means Free Voicemail cannot be used. Other providers have their own rules, so check what happens to messages before you rely on a divert. If your mobile goes to its own voicemail, the caller hears a personal greeting that does not mention your business.

What the caller hears. Some VoIP-based business forwarding, according to one provider's guide, often avoids telling the caller that the call has been forwarded. A basic network divert may not give that polish, and the experience depends on your provider.

Calling back. If you ring a customer back from your mobile, they see your personal number, not the business one. That is a trust problem for some trades and a privacy problem for sole traders. Systems that keep calls inside an app can show the business number when you call back. Plain forwarding cannot.

Out of coverage. If you are in a basement, a loft or a dead spot, the call may go to voicemail or ring out. Plain forwarding has no second plan. This is the biggest weakness of the whole approach.

Check it is working, and turn it off

EE says you can see that call divert is active from the phone icon with an arrow. Apple confirms that when forwarding is on, an icon appears in the iPhone status bar. You turn it off in the same settings you used to turn it on.

A simple habit helps. Put a weekly reminder in your diary to ring your business number from another phone. Forgotten diverts cause two problems: calls going to a phone nobody carries, and bills for forwarding you no longer need.

A security warning about star codes

Star codes can be abused. The same UK guide warns that unknown callers may trick people into dialling a code that redirects calls to the scammer, potentially intercepting bank verification calls or other private communications.

The safe rules are straightforward:

• Never dial a code a caller or message tells you to dial.
• Make sure your staff know this too, especially anyone who answers the front desk.
• If calls stop arriving and you did not change anything, check whether a divert is active and contact your provider.

Where basic forwarding falls short

Plain forwarding works for a one-person business with a quiet phone. Once enquiries matter to your revenue, the gaps show.

A UK provider's guide lists the typical limits: basic mobile forwarding cannot handle several destinations at once, has no call queuing for busy lines, and gives you no analytics on call volume.

In practice, that means:

• One destination. If that phone is off, in use or out of signal, the call is lost.
• No record. You do not know how many calls came in, which were missed or which were new enquiries.
• No qualification. The caller still needs a person. If you are mid-job, they hang up and ring the next business on the list.
• No follow-up. A missed call does not trigger a text or a callback.
• Calls only. Enquiries arrive by text, website chat and social media too, and a divert touches none of them.

For a tree surgeon on a job, a dog groomer with wet hands, a dentist mid-treatment or a letting agent at a viewing, the call comes at exactly the moment they cannot take it. Forwarding it to a mobile in a pocket does not change that.

Smart call forwarding: rules instead of a single divert

Smart call forwarding uses VoIP or virtual phone systems to apply rules. A business phone provider explains that these include time-based routing, such as diverting after hours, and sequential ringing, where several devices are tried before voicemail. Unlike a basic divert, the system manages several scenarios automatically.

Useful rules for a small service business look like this:

The more rules you add, the more you need something that applies them reliably and reports back. That is the gap between forwarding and an AI receptionist.

Our perspective: forwarding moves the problem, it does not solve it

We speak to owners of service businesses who tell us the same thing. They set up a divert, felt covered, and then found out weeks later how many calls still went unanswered. Forwarding moves a ringing phone from one pocket to another. It does not answer the call.

The real question is what a caller experiences in the first minute. If they get a person, a clear answer and a booked slot, you keep the job. If they get voicemail, many ring the next business. That is how revenue bleeds out: not in one big loss, but in a handful of unanswered calls a week.

This is why we built Talk2Aiva as a fully guided AI receptionist and revenue recovery system, not a settings page you configure alone. It answers calls 24/7, qualifies the lead, books the appointment into your calendar, and follows up by call, text, website chat and social media. Every message lands in one inbox, and your phone alerts you through the mobile app. You are still reachable. You are just not the only line of defence.

The other half is support. Setup, training the AI on your business, building workflows, launch and ongoing optimisation are part of the service. Many tools expect you to do that yourself. We think a business owner should be running the business, not tuning a phone system.

— James Paul

Where Talk2Aiva fits alongside your mobile

You do not have to give up your mobile. Talk2Aiva handles the calls you cannot take, captures the details, books the appointment and sends you the notification. You step in when it matters.

There are three plans, all priced per year:

• Software Suite: £970 per year
• Ultimate AI Suite: £2,970 per year
• Elite AI Suite: £4,970 per year

The plans differ in how much is done for you, with done-for-you setup and ongoing support bundled into the higher tiers. You can see what each plan includes on our plans page.

If you are comparing the cost of a divert against the cost of missed enquiries, it helps to put a figure on it. Count how many calls you missed last week, multiply by the value of an average job, then compare that with the yearly price of a plan.

Choosing the right setup for your business

Match the tool to how you work.

Use a plain divert if:

• You are a sole trader with low call volume.
• You nearly always have your mobile on you and signal is reliable.
• Missing the odd call costs you little.

Use smart forwarding rules if:

• You have a small team and need calls to move between people.
• You want different handling in and out of hours.
• You want call volume reporting.

Use an AI receptionist if:

• Missed calls cost you real jobs, viewings, appointments or treatments.
• Enquiries also arrive through text, web chat and social media.
• You want leads qualified, booked and followed up without your involvement.
• You do not want to build and maintain the system yourself.

An estate agent in London, a roofer in Wolverhampton or a salon in Manchester will each fall into a different category on a different day. The test is the same: what happens to the call you cannot answer?

Common mistakes when routing calls to mobiles

• Forgetting to test. Ring the number from another phone after every change.
• Leaving unconditional forwarding on. Your main phone never rings and you do not notice.
• Ignoring the bill. The forwarded leg is charged, so check your plan allowance.
• Trusting your mobile voicemail. Callers hear a personal greeting, or none, and hang up.
• Calling back from a personal number. Customers see an unfamiliar number and may not answer.
• Dialling codes you were given by a stranger. This is a known fraud route.

FAQ

How do I route calls from my business landline to my mobile?

Dial the divert code for your provider, followed by the mobile number and #. On BT and most UK landlines the immediate divert is 21, but Virgin Media customers must check their area code first. Ring your number from another phone to make sure it works.

Does forwarding calls to a mobile cost money?

Yes, it can. The forwarded call is charged at your plan's call rate, using your allowance if the destination is included, and normal charges if not. Check your tariff before you leave a divert on all day.

What is the difference between conditional and unconditional forwarding?

Unconditional forwarding sends every call to the new number without your phone ringing. Conditional forwarding only diverts calls when your phone is busy or you do not answer. Conditional is usually the better fit for a business that still wants its main line to ring first.

What is smart call forwarding?

It is forwarding that follows rules, such as time of day, or trying several devices in turn before voicemail. It needs a VoIP or virtual phone system rather than a basic network divert. An AI receptionist goes a step further by answering, qualifying and booking the call itself.

How can I tell whether my calls are being forwarded?

Look for the divert icon on your phone. On an iPhone it appears in the status bar, and on EE it is a phone icon with an arrow. If you are unsure, ring your number from another phone.

Sources

• How to manage call diverts, EE Business Help
• How to set up call diversion on landline, Virgin Media Help
• Set up call forwarding on iPhone, Apple Support UK
• How to forward or divert calls on any UK phone
• How to Forward Business Calls to Your Cell Phone, Phone.com
• Business Call Forwarding: How it Works and How to Set It Up
• Call Forwarding UK: Set Up or Cancel in 30 Seconds