A:AnswerThey automatically go into a sleep mode while in the case. You generally hear a beep as soon as you take them out to let you know they are on. Must be out of case to hear anything or pair them.
A:AnswerMy sister has that phone and they work. Samsung works with Samsung. I use my phone charger to charge these USB-C or I place them on a wireless charging mat.
A:AnswerTurn on wireless power sharing on Samsung phone in the drop-down menu and place earbuds on your phone to charge them. Or use and USB C charger including the one that can with your phone. You can also just plug them into you computer for a slow charge. I've even used my kindle charger to charge them. Wireless mats work too.