Setup Your Business Mobile

Getting started

Your new mobile service built exclusively for the UK business market; designed to deliver improved coverage for voice and data via your device that empowers, not hinders, conducting business while on the move.

Great population coverage
99% outdoor and 98% indoor

Call and text with WiFi
Stay connected in areas with no signal

Network investment
Over £2 billion is being invested in the network to continue to improve reliability, speed and call quality.

5G spectrum
Three times more 5G spectrum than any other UK network, to fully exploit the benefits of increased speeds, higher capacity and reduced latency.

Getting started with

A new mobile number

If you do not have a pre-arranged activation date please call 0207 183 3744 to activate your service.

Your service will be live within 2 hours of activation. Push the SIM out from the holder or locate your eSIM QR code.

Insert the SIM into your phone or scan the eSIM QR Code using your device camera.

Getting started with

An existing mobile number

A date to transfer your existing mobile

On your arranged transfer day push the SIM out from the holder

Insert the SIM into your phone making sure you have both old and new SIM cards with you on the day

The transfer will generally take place anytime between 11am – 4pm, Monday to Thursday.

If you try to use your old SIM in your device you will receive one of these messages ‘SIM registration failed’ or ‘Network unavailable’. You may experience incoming calls on one SIM 'card and outgoing calls on the other SIM ‘card as well as some downtime.

When you receive a ‘SIM registration failed’ or ‘Network unavailable’ message when using your old SIM, your number will have been transferred; however, it may take up to 24 hours to fully activate the service.

If you do not have an active service by 5pm on your transfer date, restart you device and if you still don’t have any service contact us on 0207 183 3744.

You will need to be in the UK on the day in order for the transfer to be successful.

Mobile data

Data Settings

To be able to use data you will need to update your data settings. You will receive a text message or notification with the settings for your handset.

Instructions for Android and iOS are available below, information for other device types is available on our “How to guides” page.

You will receive a text with the settings to activate data on your handset. Accept them when they arrive.

If you do not receive this message, settings can be sent to your device by clicking below.


For some devices the settings cannot be sent by text message so you will need to manually enter them. Click below to see the manual guides.



What is eSIM?

Similar to a traditional SIM card, an eSIM contains the necessary data for your device to connect to the Gamma network. An eSIM is a virtual SIM embedded within your device. Rather than inserting a physical SIM into your phone, you simply scan a QR Code and follow the prompts to download the eSIM profile onto your device.

It's quick and easy to setup.

You can store multiple eSIM profiles on a single device, effectively having two numbers for personal and business use, giving the ability to switch between them easily.

eSIMs are a more sustainable and environmentally friendly option than traditional plastic SIMs. They do not require any plastic packaging, which reduces waste and helps to reduce your carbon footprint.

If you’ve ordered a new eSIM from us, we'll send you an eSIM voucher with a scannable QR code.

Upon receiving your new eSIM voucher, you will need to contact us first to activate it. N.B Please note, do not scan the QR code before contacting us.

Internet connectivity is essential for setting up your eSIM.

Once activated, scan the QR code with your device camera; it contains all the necessary information to add the eSIM to your device. The instructions for setting up your eSIM may vary slightly depending on your device manufacturer. Select your device manufacturer from the tabs below to find specific setup instructions.

Yes, if you already have Gamma Mobile, you can order a replacement eSIM, if you have a compatible device.

If you accidentally delete your eSIM profile, contact us and we'll provide you with a new QR code. Alternatively, if you keep a hold of your eSIM welcome pack, you can re-scan the QR Code to reactivate your eSIM.

Yes, your eSIM will work exactly the same as a physical SIM.

Setting up your eSIM

iPhone

Using your device camera to activate your eSIM:

If your phone is running the latest iOS update, the QR code should be scannable directly from the camera. Just make sure you're connected to the internet. Use your camera to scan the QR code and then follow the on-screen instructions.

Using the settings menu to activate your eSIM:

  • Go to Settings > Mobile Data
  • Select Add eSIM
  • Select Use QR Code
  • Scan the eSIM QR code with your camera
  • When it’s recognised, confirm by pressing Add Data Plan

Samsung

Using your device camera to activate your eSIM:

If your phone is running the latest software update, the QR code should be scannable directly from the camera. Just make sure you're connected to the internet. Use your camera to scan the QR code and then follow the on-screen instructions.

Using the settings menu to activate your eSIM:

  • Go to Settings > Mobile Data
  • Select Add eSIM
  • Select Scan QR Code from Service Provider
  • Scan the eSIM QR code with your camera
  • When it’s recognised, select Confirm

Android

Using your device camera to activate your eSIM:

To activate your eSIM on Android device make sure you're connected to the internet. Access the settings menu and use your camera to scan the QR code and then follow the on-screen instructions.

  • Go to Settings > Network and Internet > SIMs > +
  • Select Download a SIM instead
  • Select Next
  • Scan the QR code on your eSIM pack with your camera
  • Your eSIM will automatically start downloading when it’s recognised
  • Once the download is complete, Select Settings
  • Select Inactive eSIM
  • Toggle Use eSIM to On
  • Your eSIM will now be active

Voicemail and call forwarding

The voicemail service will be set up automatically when your SIM card is activated.

The first time you call into your voicemail you will be asked to set up your PIN and record your name.

Information about the voicemail structure can be found here

To access voicemail call 07782333123 or use the short code 121 from your device

As standard all unanswered calls, and calls when you are busy or unreachable, are diverted to voicemail. Call forwarding to an alternative phone number can be added from your device settings menu or by calling the shortcodes:

Forward calls on these conditions: when busy, unanswered and out of reach

To set up
**004*[phone number]#

To switch off
#004#

To re-activate and forward to the same number as before
*004#

Forward calls unconditionally (your device will not ring)

To set up
**21*[phone number]#

To switch off
#21#

To re-activate and forward to the same number as before
*21#

Troubleshooting FAQs

The default PIN for your SIM card is 0000 should you need it. Please note that if you enter your PIN code incorrectly three times your SIM card will be blocked to all calls.

To unblock your SIM card you will need to obtain a PUK (Personal Unblocking Key) code by calling us.

Turn the device off and on again. If you still do not receive the network settings message settings can be sent to your device here or by texting 'settings' to 773000.

To access voicemail dial 07782333123. Alternatively you can dial the short code 121 from your device.

If you are using your existing phone, make sure all previous voicemail numbers and diverts are deleted from your current phone memory to avoid any difficulties with your new voicemail service.

The data settings may need to connect to the network may be missing. These can be sent to your device here

You can find your IMEI number by dialling *#06#

The IMEI is normally required for insurance, troubleshooting or if you lose your devices.

If your phone is lost or stolen please call us, on 0207 183 3744 and select option 3, and we will bar your SIM card. If you know the IMEI number for your device, preventing your device from being used with any SIM from any UK network.

You can find your IMEI number under the battery of your device or by dialling *#06#

If you are using a phone that was provided by a different network operator it maybe be locked to that network and will need to be unlocked by contacting your previous provider.

How to accept your data settings

Android settings

Also see our How to Guides

iOS settings – new device or no previous settings installed

iOS settings – previous settings profile installed

Also see our How to Guides

Useful Contact Details

Customer Services

0207 183 3744
Monday to Friday
0800 - 1900hrs

Lost or stolen phone

0207 183 3744
Available 24 x 7

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