from 4:30 PM today i am unable to make calls or receive calls...i have 5S, my wife has iphone 5 and my friends who stay in the same apartment complex are also having same problem iphone 5/4...even if i go out of house also i am not able to make/receive calls...i am able to do texting...the signal says LTE with 3,4 dots but when i make call it goes into 4G and nothing happens and after 30 secods it says "Call Failed"...did anybody faced this problem?