I upgraded the 900mbps Halo3+ for my broadband service and was sent a Hybrid Connect along with a Smart Wi-Fi booster as part of the package, though I had to pay postage costs for the shipment of these two items (not that I will use the Wi-Fi booster). The Hybrid Connect had 3 flashing red lights and no connection to EE's mobile network. Customer Services informed me that because I had ordered a new handset from them whilst my order for the broadband + phone package upgrade was still open it effectively de-activated the SIM card inside the Hybrid Connect. I had telephoned BT to order the phone but wasn't advised at that time that I needed to to wait until the upgrade package had been completed. Anyway, a twin pack of phones arrived though I only paid for one (confirmed by telephoning BT) and I have sent the second phone back along with the de-activated Hybrid Connect. The replacement Hybrid Connect that I was sent has exactly the same issue, 3 red flashing bars, despite moving it all around the property. Customer services told me to wait 24 hours but I thought this was pointless. So, I did some digging of my own and came across Ofcom's mobile coverage checker (link provided below) and it turns out that for indoor purposes at my address there is limited mobile coverage for EE & Three, though not for O2 & Vodaphone. Glad I checked as customer services would have had me going round in circles indefinitely, I'm sure. So, for now I have put the Hybrid Connect back in the box and will have to wait to see if anything changes regarding EE coverage in the future. I rang BT customer services to inform them of my findings and they have placed a note on my account. For anybody else going round in circles with the issue of 3 flashing red lights I hope this has been of some use to you.
https://checker.ofcom.org.uk/en-gb/mobile-coverage#pc=BB103HU&uprn=100010331644
