WhatsApp is the most popular communication service in the world, and it is incredibly popular all over the world. This software is used on an ongoing basis by more than 2 billion people living in various countries. All of them use it to exchange text messages, make voice calls, make video calls, share their location, communicate in group chats, and also perform a whole host of any other actions. However, very soon many people will lose the opportunity to do all this, since from the 1st of this service will stop working on Android and iOS, that is, on a huge number of electronic devices on which this software will simply be unavailable.
The fact is that since February 2020, using this messenger has become impossible on smartphones that are running Android 2.3.7 and iOS 8, as well as any older operating systems. Whatever phone models users use and no matter how they try to trick the verification system, it will not work in any way to connect to WhatsApp servers, and this is a real fact. As a result, as a result, the owners of obsolete mobile devices can only upgrade the operating system to a newer one by any means, or they will have to buy a new smartphone that will use the latest software available on the market now. 
The developers of the messenger argue their actions to refuse to support old OSs by the fact that they are not secure enough, containing a huge set of well-known gaps, using which third parties can easily and easily hack into a mobile device, and then, after that, get their hands on them confidential correspondence. That is why it was decided to abandon the support of such operating systems, however, starting February 1, 2021, it will be impossible to use WhatsApp entirely on newer and more modern models of mobile devices running Android 4.0.3 and iOS 9, as well as any more old ones.
That is why all owners of smartphones based on such operating systems should make sure that starting from 2021 Android OS Lollipop or iOS 10 will be installed on them. If it is not possible to install this, you will have to think about buying a new mobile one way or another devices. If you buy a modern, inexpensive model, for example, for $100, it will be enough to work with WhatsApp for at least five years, so this kind of purchase will definitely pay for itself. It is expected that in a few months, the developers of the world’s most popular messenger themselves will announce that they are going to refuse to support old OSs, which now have more than 300 million mobile devices, and many of them are actively used to this day.