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S31 FAQs

Browse the FAQs below to find quick answers to your questions and if you don't find the answer, please tell us

Question 1. How do I perform a reset, when my screen is blank?

1. The device has an embedded battery that can only be accessed by authorised personnel.
2. To reset the device, open the SIM card and SD card door, behind the door to the right is an “OFF” button.
3. Depress this button and the device will power down, restart the device.
4. Device will now power on, perform and charge as expected.

Question 2. In error I have accidently deleted an App, how do I recover?

1. Visit the Google Play Store, open it and make sure you are on the homepage of the store.
2. Tap on the settings icon in the upper right of the screen
3. Tap on My Apps & Games.
4. Tap on Library, all previously installed App's will be located here.
5. Select the App required

Question 3. How do I resolve when Poor Sound Quality is experienced following immersion in water?

1. If the handset has been subject to immersion in water then the microphone and speaker will need to dry out for them to resume to normal functionality.
2. Place the device in an area where the microphone and speaker can dry out.

Question 4. How do I take a screen shot on the device

1. Migrate to the screen that you want to capture
2. Whilst on the screen press both the Power button and Volume down button for approx. 2 seconds

Question 5. What is the Yellow button for and how do I use this?

1. This is a programmable button, you have a number of options to choose from.
2. Go to the settings menu, scroll down to “Programmable Key” and select.
3. You will have a the option of Short Press and Long Press allowing you to program each to a specific App. This will open a selection that you can choose your favourite from for example Camera on short press and Maps on Long press.
4. Then select ‘OK’
5. When you return to the home screen now when you can short or long press on the programmable button the device will go to your selected view.

Question 6. How do I find my IMEI Number?

1. This can be found on the outside of the box that you received your phone in and makes up part of the Approval’s label.
2. If the IMEI is not available, Type into the device via the keyboard*#06# a pop up box will show the device IMEI.
3. In addition there is a plastic label beneath the SIM tray, remove the tray and pull the label out the IMEI is printed on the underneath.

Question 7. How do I know there is a device update available, how do I check I have the latest SW?

NOTE: When a new Firmware/Software is available, notifications are sent out to all CAT S31 devices.
On the home screen an Icon will show in the notification panel. When the icon appears you can drag down the notification panel and select.
To manually update.
1. Go to settings menu.
2. Scroll to the bottom of this screen, and select “About phone”
3. Select the “System updates” option, check for updates if update available
4. The device will check the battery charge level and may ask you to further charge.

Question 8. How do I carry out a Factory reset on the device?

Note: Before performing this activity ensure you have backed up and secured your data.
1. Go to settings menu.
2. Select Backup & Reset, select “Factory data reset”.
3. Select “Reset phone”, and “Erase everything”.
4. The device will then reboot.

Question 9. I have some issues with Windows 10 and the S31 how do I resolve?

Recently Microsoft Windows updated Windows 10 and this has caused an issue with MTP driver.
The MTP driver is called Media Transfer Protocol this helps user’s transfer data between Windows and our Devices
To fix this issue the user needs to perform the following steps
1. Go to Start Menu (or Cortana) Search. Just click the Search for Cortana icon in the Windows 10 taskbar and type “Run.” You’ll see the Run command appear at the top of the list, open the program
2. Type in the following

Question 10. How do I enable/disable delivery report and read report for messages?

1. Launch the Messaging app
2. Within the app bring up the Settings menu
3. Scroll down to “Text (SMS) messages” section
4. Next to “Delivery reports” tick to enable/disable delivery reports for SMS

Note: read reports are not available for SMS messages
5. Scroll down to “Multimedia (MMS) Messages” section
6. Next to “Read reports” and “Delivery reports” tick to enable/disable read and delivery reports for MMS

Question 11. How do I customise the Notifications, sound and vibration for incoming messages?

1. Launch the Messaging app
2. Within the app bring up the Settings menu
3. Scroll down to “Notifications” section and select
4. Select the “Sound” menu to select required ringtone
5. Next to “Vibrate” tick to enable/disable vibration for incoming messages.

Question 12. How do I turn On/Off predictive text?

1. Go to Settings menu
2. Scroll down and select “Language & Input”
3. Select current keyboard for example “Gboard” option
4. Scroll down and select “Text correction” then select the level of correction that you require.

Question 13. How do I enable/disable Bluetooth and connect Bluetooth tethering?

Note: Bluetooth tethering is subject to being included in your data package with your Network Operator.
On the device
1. Go to the settings menu and enable/disable. In this case enable.
2. Return to settings menu and Select “More”
3. Select “Tethering and Portable Hotspot”.
4. Select “Bluetooth tethering”, return to the previous screen and then return once more to settings window.
5. Select Bluetooth to make your device discoverable.

Next steps:
1. On your PC/Lap top search for Bluetooth devices
2. Select your device and connect to it.
3. Once your device is connected and the drivers are successfully installed, click on your device from the list of connected devices. Tethering complete.

Question 14. How do I pair to another Bluetooth device?

1. Go to Settings menu.
2. Beneath the Wireless and Networks settings you can see the Bluetooth button.
3. Select Bluetooth by tapping on Bluetooth
4. The “Search for Devices” will start.
5. Select the device you wish to connect to in the list displayed.
6. Confirm the passkey shown on your device and the device you want to pair with is the same and then select “Pair”.

Question 15. How can I transfer data to another device via Bluetooth (for example an image)?

1. For example go to Photo menu.
2. Select the folder that contains the file that you wish to transfer.
3. Select the image that you intend to forward, select icon at the top of the page, select Bluetooth.
4. Select the device to send to and send.

Question 16. How do I copy contacts from the SIM card to the Device?

1. Go to the “Contacts” menu and settings
2. Select “Import/ Export and Impprt from SIM card”.
3. Select contacts to be imported or select all.
4. Then select ok.

Question 17. How do I Clear the cache and browser History?

1. Go to “Chrome” menu.
2. Select the Menu and then settings.
3. Select “Privacy” option
4. At the bottom of the screen is the message “Clear Browsing data” select.
5. Select the browsing history, Cookies and site data and Cached images and files to be cleared.

Question 18. How can I back up data to an external storage device?

1. Connect the CAT S31 to the PC/Lap top via the supplied USB cable
2. On the screen of the S31 a notification will appear, "USB charging" this device, click on this notification
3. On the screen you will see a number of options, select transfer files.
On the PC
1. Go to start screen and select S31, choose what to do with this device
2. Select Internal shared storage or SD card
3. Select the folder and files that you want to save or move to the PC
4. Capture and move to the desired location on the PC.

Question 19. How do I ensure in do not disturb mode the clock alarm will be heard?

1. You will need to set priority interruptions, this can be done through settings menu and selecting sound and selecting do not disturb.
2. Select Priority only allows
3. In here you have Priority interruptions, select from Alarms, events and reminders you will receive your alarm at the time set.
4. In addition you can receive designated calls or messages by activating then going to “Calls/message from” and managing your contacts list.

Question 20. Why does the Device not make certain calls?

During use the device will not make calls for example to International numbers, Check if Fixed Dialling Numbers (FDN) is enabled:
1. Go to the phone menu and select settings, select Call Accounts and tap on the desired ] “SIM”.
2. Select Fixed Dialling Numbers (FDN)
3. In this screen you can enable/Disable FDN, you will need to know the PIN2 code. You can also manage the list of FDN from this page.

Question 21. Why do Calls to this device get picked up by other devices?

1. Go to the phone menu and select settings, select Call Accounts and then the desired “SIM”.
2. In this screen scroll down and select “Call Forwarding” and then Voice.
3. Check if the “Always forward” option is enabled, if this is the case disable. In this screen there are three further options “forward when busy”, “Forward when unanswered” and “Forward when un reachable”.
4. Enable/Disable the functionality you desire.

Question 22. How is Caller ID enabled/disabled on this device?

1. Go to the phone menu and select settings, select Call Accounts and then the desired “SIM”.
2. In this screen scroll down to “Additional Settings”.
3. There are two options in this screen “Caller ID” and “Call waiting”. Select Caller ID, a pop up window will appear with three options, “Network default” select this if you are aware of what the default of the Network is and if that is what you require.
4. “Hide number”, check this is not set as this will prevent the caller ID being displayed at the receiving device.
5. “Show Number”, select this to ensure Caller ID is displayed at the receiving device.

Question 23. What does the Message please Insert SIM card indicate?

1. Make sure that you have correctly inserted the SIM card – The SIM card port cover has an illustration of the required SIM card orientation.
IMPORTANT NOTE – Do not insert the SD card to the SIM slot this may damage the SIM card reader contacts and the SIM card will not be able to be read. The device will need to be returned to the Service centre.
2. If correctly fitted and the message is still displayed, please clean the contacts of the SIM card using a dry cloth.
3. If still not being recognised please call your Network provider to ensure the SIM card has been enabled or to check if they have any further instructions.

Question 24. What should I do if the device displays message “No Service”?

1. This may be displayed if you are in an area that is not covered by your Network provider, or if you are in an area of poor reception for example an enclosed area.
2. No service will be displayed on your screen until the situation is resolved by relocating to an area of service.
3. If this problem persists when in a known good service location, contact your Network provider to ensure there are no restrictions on service or your SIM services.

Question 25. What do I do if “Emergency Call only” is displayed on your Home screen?

1. This will be displayed if there are issues with the SIM card
2. Additionally if you are in an area not covered by your Network Provider.

Question 26. What do I need to do if “Enter PUK code” is displayed?

1. Following three consecutive failures to input the correct SIM card PIN code, the PIN code will be blocked and the request for the PUK code will be displayed.
2. Before attempting to input the PUK code ensure that you have the correct code provided by Network provider.
3. After ten unsuccessful attempts to input the PUK code, the SIM card will be permanently disabled.
4. Once the SIM card is permanently disabled you will need to contact relevant body to purchase a New SIM card.

Question 27. What should I do when experiencing Reception Issues?

1. Poor quality of calls: Please check if the volume of the device is adjusted to an acceptable comfortable level.
2. When the device is used in the areas with poor signal, e.g. near the high buildings or in basements, the call quality may be affected adversely.
3. When this device is used in a high call intensity period, like the rush hours, call failure may be caused by network congestion
4. Standby time is reduced, Standby time is related to the system setting of network, it may be that the phone is used in an area with poor signal.
Where there is poor signal, the phone will constantly attempt to communicate by searching for base station signal and battery will lose charge quicker, hence the standby time is reduced.

Question 28. How do I resolve when Poor Sound Quality is experienced?

There are a number of contributing factors which can affect the audio performance of your device for example:
1. If the handset has been subject to immersion in water then the microphone and speaker will need to dry out for them to resume to normal functionality.
2. If the incoming call has been routed long distance and is being routed through a number of service providers telecoms infrastructure.
3. Technical performance between handset manufacturers, this can be software or hardware related.
4. The environment the handset is used in, especially where there is background noise, typically traffic in a busy city environment or large shopping malls and airports.
All handset manufacturers must design equipment to work within very rigorous standards set by organisations like the European Union for example, these are normally safety based so that you do not suffer from hearing problems with extended use.
All CAT products meet these safety standards and hence are CE marked as an assurance that we comply with these standards and our audio levels are within safe limits.

VIew all technical specs


Non-removable Lithium Ion
Talk Time
30 hours
StandBy Time
38 days


Display Type
4.7” HD 720 IPS, wet finger/glove on working technology*, Super Bright Display
Display Cover
Corning® Gorilla® Glass 3


8MP Autofocus, LED flash
2MP Fixed Focus


Audio Jack
802.11 b/g/n (2.4G)
micro-USB 2.0, USB-OTG
Sim Type
Nano sim, dual and single SIM variants

data speed

Data Speed (Maximum Downlink Data Rate)
Data Speed (Maximum Uplink Data Rate)


ROM Flash
Extended Storage
microSD™ up to 128GB



Processor Type
Qualcomm MSM8909 Quad core
Google Android™ Nougat


IP Rating
IP68 Certified
Up to 1.2m for 35mins
Dust Proof
Dust Resistant
Drop Test
Up to 1.8m (6ft)


Proximity Sensor
Ambient Light Sensor
Military Standard
MIL-SPEC 810G, Shock and Drop, Operating Temp: -30°C (-22°F) to 55°C (131°F), Category 4 vibration


146 x 74.42 x12.6mm


Contact our Customer Service team



In the unlikely event of an in-warranty fault, contact our Customer Service team who will be happy to help