When my SIM card is connected to a certain operator, it gets disconnected frequently. What do I need to do?

The SIM card will automatically connect to the operator that has the best signal in its current location. With some operators, even if there is good coverage and a good signal, there may sometimes be disconnections caused by problems with the cell to which the SIM card connects. If the option is available on your device, you can deal with this problem by connecting your SIM card to a specific operator by manually selecting one of the operators picked up by the device in its current location.