*** THIS NO LONGER WORKS *** I bought a T-Mobile prepaid cellphone at Best Buy (Samsung T369...which was probably overkill) and activated the SIM card that came inside. I activated with the IMEI from the T369 and set up the Pay As You Go account, and purchased a $30 top off card and added it. Bammo. Instant cell phone service. I changed NO SETTINGS on the APN or anything. Then after some finaegulling due to T-Mobile's initially confusing setup, I was able to purchase a web day pass for $1.49. Essentially, if you are currently not on a web day pass, and the SIM is inserted, all you need to do is launch your browser on the S7, with WiFi OFF (this is important as it activates the cellular modem), and you will be re-directed to an upsell website where you purchase a web day pass. Also, the Android T-Mobile "My Account" app works, and shows you your balance AND provides a link to "Buy A Web Pass". So, the Samsung phone includes $10 to get you started. Then you add your refill card. That total value is good for 90 days if you are on the Pay As You Go plan. Then as needed, you punch up a Web Day Pass and for $1.49 you get 24 hours of unlimited data! ** NOTE ** This no longer works....please read on for my experience!