You are comparing apples with oranges.
Broadband speed is determined by your distance from the Cabinet if you are on Fibre Broadband or the distance from the exchange if you are on "normal" ADSL broadband. Your speeds are also affected by the condition of the copper cables which the signal travels along.
4G is basically a radio signal to a mast then fibre from the mast to the phone network which means that provided there is nothing blocking the radio signal it can travel in theory at 100Mbps.
Same here, 34 down and 10 up on 4G, 15 down and 0.7 up on bt fttc.
It wont get any better either when bt/openreach install gfast from the cab!! the fast will get faster and the slow (people far, i say far, im less than a mile from the cab will stay where they are!)
Its a backwards way of thinking gfast from the cab, they said the point of gfast was they were going to put pods on poles for people who were a bit further from the cab.
And no doubt line rental will increase again and again !!
The 4G packages are coming down and down now, BT 15GB for £15 , £90 amazon voucher £60 quidco. Virgin are doing 20GB for £15.
If one does 40-50 gb for £20-£25 , my land line is going!!
Long reach VDSL and 3db profiles will help me when they come out next year. My downstream is stuck on 10db!