If you have a poor or even no mobile 4g signal there is nothing BT can do to increase your signal as it is EE network
Have you checked the EE Mobile coverage checker for your area or did you check it before starting you contract?
The one who sold on BT, has done all the checks and assured that hybrid connect will work in my area and at home
But have you checked the coverage using EE website?
It may be coverage is poor or it could be that moving to another location in your home the signal improves
If mobile signal non existent then phone CS 150 and drop halo 3 from your package
Checks are made before an order can be raised that there is suitable 4G coverage but there will always be a house/room etc where there is no or weak signal, some find moving the hybrid connect closer to a window or the other side of the house helps, you have 14 days from when the order goes live to change your mind, if it doesn't work for you then you can revert to the previous package you had.
I have tried every corner of my home, was standing out of window with hybrid connect in my hand but seems some real issues with EE signal.
Hybrid connection is sold to me as I needed desperately to WFH, till BT broadband line is sorted.
But none of them is working.