Hey guys, I got a new Blackberry Classic from my job, to try, I took my ATT sim out og my iphone 6 called ATT gave them the new IMEI # off the blackberry all was fine, except no LTE on the blackberry only 4G.. When I got home I calledATT to put the Sim back in the iphone 6 gave them the Iphone 6 Imei ( where the card came out of originally ) and same thing now on the Iphone 6 NO LTE .. Just 4G .. Called ATT several times and they say phone is bad, I said are you kidding me? I popped my wifes sim in my phone and LTE is FINE! Now they are saying maybe the SIM CARD is BAD? How does a sim card go bad in 6 hours? When it worked fine in the iphone from day one! They checked the Imei on the iphone and their end, all is good, I did a Network Reset, I put it in Airplane mode NO LTE .. I just dont understand how a SIM CARD can go bad after putting it in another phone .. Any thoughts would be great..