I am considering the offer that BT have sent me for an upgrade for the Complete WiFi service
I currently have no coverage in one room and weak in two others
The term ‘strong’ is open to wide interpretation - is there any technical data available of what BT consider a strong wifi signal?
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Because wireless signals can suffer from interference and be blocked by the structure of your home all of which are out side BT's control I doubt you will find any definitive answer for what a strong signal is.
BT do however state that you will get a "strong" signal in every room and if not they will send you a further two discs to achieve that.
I would say that if you are measuring the signal strength you should expect to get between -65 to -70dBm
BT have this in the small print
Complete Wi-Fi guarantee
96% UK availability. BT sends additional discs to guarantee at least 10 Mbps in every room of your home. Sky send one additional disc and guarantee 3 Mbps or money back. No other provider offers a faster Wi-Fi Speed Guarantee than BT. To verify e-mail firstname.lastname@example.org. We’ll send you up-to three discs to ensure a strong signal of at least 10Mbps in every room of your home. If you still can’t get a strong signal we’ll give you a one-off credit of £20 off your next BT bill. Guarantee only applies when your Smart Hub2 is connected to the internet and does not cover broadband faults. For full terms see bt.com/legalstuff.