Let's compare old SIMs and new ones. Old SIMs are physical cards. You insert them into your phone. They hold one number. They are tied to one network. If you want to change, you need a new card. On the other hand, smart SIM card numbers are different. They are often embedded. They are part of your phone. They can store many profiles. You can switch networks with a tap. This makes t... b2breviews.club