What actually is ‘5G’?
5G stands for ‘fifth generation’ (of mobile communications networks). 5G is
While 4G works on the frequency spectrum ranging from 2–6Ghz, 5G
will work on the frequency spectrum of 30–300 GHz, creating much faster speeds for a much high number of devices.

Is 5G safe?
From a health perspective, the long-term effects of constantly being exposed to such forms of radiation
From the perspective of a government, however, such huge amounts of data could lead to data leakages, spying, and a bunch of other problems. Which is why the USA and a bunch of other countries are outlawing HUAWEI 5G over concerns that the Chinese government could force the third largest mobile phone company to hand over sensitive data.

When is it Coming and Will it Work?
Japan is considered to be one of the first countries to implement 5G technology on a country-wide basis. The country hopes to have implemented most of the systems by 2019 – just in time for the Olympic games, which would allow many people to watch the events in 4k (incredibly high-definition) TV.
Changing from 4G to 5G is no simple task. 5G runs on much higher frequencies than 4G, which means it is harder for 5G signals to pass through buildings. This means large upgrades to the current 4G structure will be required to provide a stable service for the whole country. Not only this, but the government is urging communication companies not to use Chinese equipment when rolling out the service. SoftBank, one of Japan’s top three phone companies currently has around 1/3 of it’s 4G network running on HUAWEI equipment.