WhatsApp is not yet available for this device, but it is supposedly still to come. The phone is not suitable for surfing.

Whatsapp is available on this phone through the KAIos market. It useful to know who contacts you and read their messages. But I almost never lose the time on righting on a keyboard like the B35 has.

Facebook, Twitter, Whatsapp, Google Maps and everything else you need is already there, but surfing is no fun because of the small screen, but it's OK for short text messages and searching for addresses on Maps. The Chinese operating system is trimmed to save energy and is intended more for the necessities. It lasts 14 days in normal use and 30 days in standby. It is heavily protected, so if you drop it, it won't be scratched, and if you drop it in water, it won't be damaged.
Caterpillar has mobile phones that are designed to be robust, including smartphones. If you drop your expensive Samsung or iPhone smartphone all the time or drop it in the bathtub all the time, you should buy a Cat S31, S41, S60 or S61 smartphone, depending on your budget.

Unfortunately, we do not have any further experience in this regard and have therefore forwarded the enquiry to our community. I hope a buyer can comment on this.