I use Samsung E7, and both cards are mobile. Why is it that card 2 is so easy to receive spam calls, spam text messages, and fake base stations? There are very few cards 1,

You can turn on the Do Not Disturb function to mute all calls and prompts on your phone except selected exceptions. How to turn it on: Settings-Device-Sounds and Notifications-Do Not Disturb Mode-Enable Now-Allow Exceptions-Alarm Clock/Call/Message-Select the required ones to turn on, set calls/messages from the following objects-select All/Only Favorites/Contacts only. (This option is optional after turning on the call/message do not disturb function above. Once selected, other incoming calls will be muted.)