Classic telephones, or so-called feature phone has slowly disappeared from the market over the years – only Samsung and the Chinese have produced it. With the acquisition of Nokia by HMD, the manufacturer began to resurrect simple models. First, it was Nokia 3310, and now the once popular banana, the Nokia 8110. New devices can, however, much more than they used to.
The Nokia 8110 4G is a classic phone with a sliding flap and a banana-like housing. It is the spiritual successor of the once popular 8110 Matrix. The device was shown at MWC 2018. Few people know that the usual seemingly, the phone is based on the KaiOS operating system. It has nothing to do with the old S40, on which classic Nokia models were based. So what is KaiOS? 
KaiOS has good support, and Google sees potential and invests
How did it start? A few years ago, Mozilla released a system called Firefox OS. Unfortunately, due to the lack of good optimization and interest of developers and producers, the system literally burned – fortunately, not really, because KaiOS draws its full strength from Firefox OS . The system has been adapted for classic phones. Of course, it's based on Linux, and what's interesting, more than 30 million devices around the world are already under its control. Now Kai Technologies has received powerful financial support, as much as 22 million dollars from the giant, which is undoubtedly Google. This means that on devices based on KaiOs, we will soon see applications such as Google Assistant, Maps and YouTube. It should also be mentioned that Facebook and Twitter applications are also available for KaiOS , and WhatsApp is on its way.
The Nokia 8110 4G is almost a smartphone
Almost makes a big difference though. The phone is equipped with only a Snapdragon 205 processor clocked at 1.1 GHz, GPU Adreno 304 and 512 MB RAM . The internal memory is only 4 GB. More than one owner of a smartphone would laugh at such parameters, but remember that we are dealing here with a substitute of a smartphone, or feature phonem with the KaiOS system, which will allow to run a bit more than just simple Java games. Anyone interested? source: phonearena.com