Find quick tips, suggestions and support on how to use your Cat phone to its full potential.

B35 FAQs

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

What type of screen does the phone have?

The display is a 2.4" QVGA TFT LCD screen. It is not a touchscreen. You can navigate it using the 4 way navigation with keypad buttons.

How big is the memory and storage?

512GB RAM - 4GB ROM. External microSD™ card supported - Type SDXC Class 10/Ultra high speed/32GB

How big is the battery?

The Cat® B35 has a 2,300mAh battery.

Is the battery removable?

No, you cannot remove the battery.

What type of connectivity does the phone have?

"2G,3G and 4G LTE, Wi-Fi 802.11 b/g/n, 2.4GHz, Bluetooth 4.1 HFP, HSP, A2DP,OPP, PBAP,
Micro USB 2


Which apps are pre-installed?

Google Search™, Google Maps™, the Google Assistant™ and YouTube™ are preinstalled as well as the main KaiOS apps.

What type of headphone connection does the phone have?

3.5mm Type CTIA

What should I do if the phone does not turn on?

"Hold down the Power Key for 5 seconds.
If the device does not power on then try charging the device according to the charging instructions in the user manual.
If the device will not charge then please try holding down the Power Key for 20 seconds to reset the device."

Why is the phone asking me to insert SIM?

Make sure you have correctly inserted SIM card. If you have installed it but it cannot be detected, please try to clean the SIM card using a dry cloth. If it still is not working, please contact your network carrier.

What does the 'No Service' message mean?

If you are in an area not covered by your network, or if a physical obstacle is present, or you're in an enclosed area, the message “No service” will be displayed on your Standby screen. You will not be able to make or receive calls whilst this message is showing.

Why is the phone saying I can only make Emergency calls?

This might be displayed if either SIM1 or 2 cards are not recognized, or when you are outside your network but inside other networks. You can only make emergency calls during this time.
Check with the Network provider that the SIM card is still valid.

Why does the phone say 'No valid SIM card'?

Your SIM card may be locked or have an error.

Please insert the right SIM card or contact your service provider to discuss the status of the SIM card and options to validate the SIM card or purchase recommended SIM product.

What should I do if the phone is asking me to enter a PUK code?

After three consecutive incorrect SIM card PIN code entries, the code is blocked, and you need the PUK code to unblock it. Contact your service provider.

After ten consecutive incorrect PUK code entries the SIM card will be permanently disabled. If you disable the SIM card following the incorrect input of the PUK code, you will need to contact the service provider to buy a new SIM card.

What do I do when I have problems with service?

There are a few quick checks you can do:
1. The device may be outside of the network coverage for the network service provider; to recover, you will need to re-locate to an area covered by the Network provider.
2. SIM card is invalid, please contact your network supplier, if the SIM card has recently become invalid, you need to contact the Network provider to check why the card is no longer valid and how this can be resolved.

What is the battery life - talk time - standby time?

These are estimated as the actual results depend on the network environment, apps and connectivity settings. Estimated at 12 hrs talk time and 30 days standby time.

How can I turn on Google Assistant?

Via the app menu, or by a long press on the Select/"OK"Key

Are there more apps available?

Yes, these can be downloaded from the KaiStore.

What is KaiOS?

KaiOS is a simple, light weight operating system designed for 4G enabled feature phones. It is not a complex smartphone operating system, but it does offer some smartphone experiences through light weight versions of popular applications such as the Google Assistant and Google Maps.
You can also download games and apps via the KaiStore.

What type of SD card does the phone support?

SDXC Class 10/Ultra high speed up to 32GB

Will there be future software updates?

Yes, you can expect to receive software updates.

Is my phone waterproof?

Yes, your phone is waterproof and can withstand salt mist. It can be submerged in up to 1.2m (4ft) for 35 minutes.

What happens if my phone screen breaks?

If your screen breaks, it might be covered under warranty. Read more about your warranty here or please contact customer support here

What happens if my phone breaks?

If your phone breaks, it might be covered under warranty. Read more about your warranty here or please contact customer support here

What is the KaiStore?

The KaiStore is where you can find apps for your Cat® B35 such as Facebook and Twitter.

VIew all technical specs


Removable Lithium Ion
Talk Time
StandBy Time


Display Type
2.0″ QCIF, 176*220


Video Capture


Audio Jack
micro-USB 2.0, USB-OTG
Sim Type
Micro sim

data speed

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


ROM Flash
128 MB
64 MB
Extended Storage
microSD™ up to 32GB


Audio Playback
Audio Recording
Video Playback
Video Recording



Processor Type
Spreadtrum 7701


IP Rating
IP67 Certified
Up to 1m for 30minutes
Dust Proof
Impervious to dust
Drop Test
Up to 1.8m (6ft)


118 x 54 x 16 mm


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