There are still some issues that may come up because of premature 5G. The first issue is the range that it is going to transmit data. There are some people who are saying that its radio frequency will operate in the range wherein there are already other signals that are available such as satellites.
Another disadvantage is that it does not have enough coverage yet in order to become available to various people from all over the world. It will be safe to say that the network that will become available to people is still limited at this point in time. Of course, this is expected to improve in the long run, but now that it is still new, there are still many changes that need to be made.