What is the difference between changing devices and moving numbers?

I heard that there is a device change and a number transfer when you change your phone. What's the difference between the two?

410 2019-08-25 Gentleman

popular What are the side effects of oats?

popular How do I recycle and recycle foil like cooking foil?

popular What is the nationality of Minnie?

popular Do oats also have side effects?

popular Is hair spray not allowed on the plane at all?

Same Tag How do I share files between my smartphone and computer?

Same Tag Can I buy Maple Gold among Galaxy S8 Plus colors?

Same Tag If I do routing, can't I do financial apps like bank apps at all?

Same Tag What happens if I don't pay for my cell phone insurance?

Same Tag How much does it cost if I took out insurance when I exchanged the iPhone 7 LCD?

Same Time What is the best way to share pictures of iPhone and Android phones?

Same Time What is the difference between changing devices and moving numbers?

Same Time Is there any mild tint?