Des on Twitter: "Let's talk about SIMs! Always move to the newest SIM card available to get the most out of the @TMobile network! The way you can tell is on the
US T-Mobile Prepaid SIM Activation Guide – dataGO
You can now self activate t-mobile SIM to TNX program from Sprint.com website. I have successfully activated it on Samsung Galaxy A71 today using t-mobile R15 sim card. Download t-mobile App experience