I bought an S4 several months ago. It's been working fine until this morning when it gave a message saying the sim card failed. Assuming the sim card was bad, I attempted to buy a new one from Verizon. After entering IMEI number it said the S4 wasn't supported. I know Verizon is upgrading their network in a week and some phones will no longer be supported. Is the S4 definitely not going to work in the new network?