If you are looking to switch/get cell/mobile phone services that allows you to bring your own device (BYOD), and you just need a SIM card to insert into your phone then activate it by calling that service provider, then
This SIM Kit is what you need!
It is just a SIM card that is sold at Best Buy, Walmart, Target etc., except they seem out of stock presently as I hunted for one! Target even told me they won't be stocked again! So, if you are searching for a new SIM card, email me.
Cash and physical exchange only -- kindly include WHEN you can come to the intersection shown with cash.