I have two lines on my account, one of which is a 3G flip phone my grandmother keeps for emergencies in her car. I know the 3G phone will no longer work after the 4G change over, so Id' like to give her an old Blackberry Classic to use. The Classic I currently have on another line works on the 4G network, but I can't get a clear answer as to 1. whether my own Classic will still work after the change over (I feel like it should since it appears to be picking up 4G and 4TG LTE now) and 2. whether we can activate another Classic to replace the flip phone?