A:AnswerHello JC, thanks for reaching out! Please follow this link (https://www.samsung.com/us/mobile/galaxy-s10/compare/?device-1=samsung-galaxy-s10%2B&device-2=samsung-galaxy-s10&device-3=samsung-galaxy-s10-lite) to see how the devices compare. ^Elizabeth
A:AnswerYou shouldn't need a new sim because the phones are only 1 generation apart. As long as the chip is a nano sim you should be fine. I kept my sim from my old smartphone from 2 years ago and put in the 10+
A:AnswerIf you have a carrier you can activate on the spot. I purchased an unlocked phone and then just switched my sim card since I use straight talk. You will get a better deal of you sign a contract but if you don't want a contract buy unlocked phone and activate later
A:AnswerLooking at the storage screen, seems maybe 100gb or so would be free out of the 128gb. Mine says 96gb available but i have a few gigs of music on internal storage.