Getting Started
Gamma Mobile service is 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
Network investment
Over £2 billion is being invested in the network to continue to improve reliability, speed and call quality.
Call and text with WiFi
Stay connected in areas with no signal
5G spectrum
With 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 0333 014 0333 to activate your service.
Your service will be live within 2 hours of activation. Push the SIM out from the holder.
Insert the SIM into your phone.
Getting started with
An existing mobile number
A date to transfer your existing mobile number will have been arranged
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
Transferring an existing number FAQ
- When will the transfer take place?
The transfer will generally take place anytime between 11am – 4pm, Monday to Thursday
- How will I know when I have been disconnected from my old network?
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.
- How will I know when my number has been transferred?
When you receive a ‘SIM registration failed’ or ‘Network unavailable’ message when using your old SIM, your number will have been transferred.
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 0333 014 0333.
- Do I need to be in the UK to transfer my number?
You will need to be in the UK on the day in order for the transfer to be successful.
Mobile Data
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.
For some devices the settings cannot be sent by text so you may need to manually enter Gamma in the data settings of your device by clicking below.
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
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 FAQ
- My device says emergency calls only
Turn the device off for 1 min and turn it back on again.
- I have been asked for a PIN code for my SIM
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.
- I have blocked my SIM card how do I unblock it?
To unblock your SIM card you will need to obtain a PUK (Personal Unblocking Key) code by calling us on 0333 014 0333.
- I didn’t receive my network settings
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.
- What is the voicemail number to call?
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.
- I can’t connect to the internet on my phone
The data settings may need to connect to the network may be missing. These can be sent to your device here.
- How do I find my phone details?
You can find your IMEI number under the battery of your device or by dialling *#06#
The IMEI is normally required for insurance, troubleshooting or if you lose your devices.
- My phone is lost or stolen
If your phone is lost or stolen please call us, on 0333 014 0333, and we will bar your SIM card.
If you know the IMEI number for your device, we can also bar the device, preventing your device from being used with any SIM from any UK network.
- My device is not working with my new SIM
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.
Useful Contact Details
Lost or stolen phone
0333 014 0333 (option 3)
Available 24×7
Provisioning queries
0333 014 0333 (option 3)
[email protected]
Monday to Friday 0900 – 1700hrs
