I was doing some research and knew I needed to get an IPad Mini AT&T 4g LTE if I wanted to make the swap from my tmobile plan. So I went to the tmobile store to have them make me a nano sim for $20, which deactivated my current gsm SIM card. I place the new nano sim in the iPad mini an voila, tmobile pops up with 3G in upper left corner. I think everything is in the good but I try to use the Internet and its a no go. I go through the apn settings and use fast.t- mobile.com, epc.tmobile.com, epic.tmobile.com, etc... And none of them work. I live in San Diego btw where I am able to get 3G/4g on my galaxy nexus so I'm wondering why my prepaid data plan is not working here. The only thing I can think of is updating the carrier settings to 14.1 but I still don't have the option through options and about page. The current OS is 6.1.3. I think when LTE rolls here I won't have any problems finally getting data but this makes no sense. Will the apple store help me in this situation?