A:AnswerYes it does work with the 3g/4g Reolink camera. Just u need to activate the SIM card on a T-Mobile phone fist then you can put it inside the camera. I can confirm this because I use this very camera with this sim card kit and it works as intended.
A:AnswerIt's real simple
You put the sim in the phone and fill out that info within the phone to set up.
Then you look at the t-mobile pre-paid instructions.
Then you call that number and then they will walk you through the rest.
If you want a current phone number transferred, it's a little more complicated.