EE sent me a signal box because Wifi calling was unreliable at best even with a 50mb connection. So I got the signal box yesterday and got it activated. My 6s wouldn't connect to it even though my son's phone did, so I phoned up we got that sorted, it ran fine for a couple of hours then flashing green, phoned up again and we reset it etc it's been flashing green since. It's not been working for longer than it's been working, I got 2 hours out of it. Its been off since 7pm last night.