The SIM card tray on your Galaxy S7 Edge keeps your SIM card secured and lined up with the electrical contacts so you can have access to your preferred mobile network. It is a delicate component however, so it is easy to break if it s out of its housing. If this part does get damaged, your SIM card may not have good contact with the receptacles, meaning the connection of your SIM card may not be reliable anymore. This can get annoying if your cellular connection is working one moment but it disappears. Get rid of this problem by exchanging the original SIM card tray with a brand new high-quality part.