jonoj

Did you use the SAME micro filter in all the sockets or multiple filters. If you have a faulty filter, then that may cause dial tone to be removed, especially if it all worked before, its possibly short circuit. The filters apply the filter part of the circuit to the telephone socket part, and the ADSL socket for the modem normally is exactly the same as the line coming in (the connection comes off before the filter for the phone line). So the ADSL/VDSL will work without filters but there is the possibility that noise from the unfiltered phone line would cause the line to resynchronise. The connection to your house is a pair of wires, and traditionally wire 3 would connect through to wire 2 through a capacitor. This is for old phones and new modern phones dont need this wire any more, but this in effect creates an unbalanced pair and acts as as antenna for noise if you have lots of extensions this can reduce the bandwidth as adsl/vdsl works most effectively with a balanced pair. Personally i disconnect wire 3 and see a small improvement and have never had a phone not ring because of this modification.

I use a BT hotspot https://www.shop.bt.com/mini-sites/connected-home/home-hotspots - I find that i get the best of both worlds, a hotspot (mine covering the upstairs of my house) and these have two LAN ports on there as well for wired connections. I have a NAS drive and a PC that I use VOIP on in the wired connections rather than using WIFI and just use WIFI for handsets or internet only applications. I would always use wired/powerline over WIFI for VOIP/streaming/gaming but it depends on what you are using it for. BT also do a whole home WIFI set https://www.shop.bt.com/learnmore/bt-branded-products-and-services/bt-whole-home-wi-fi/ that could fit your needs

http://www.mpsonline.org.uk/mpsr/ mail preference service in an attempt to reduce the marketing material through your door.

Mine can be the same, notchy moving between gears rather than crunchy, once warm the gear box is much better. I guess its something to do with the transmission oil.

Cross talk does indeed exist however this is a bandwidth challenge and not an usage issue. If you look for "DSL bandplan" on google you may find more information about "cross talk" When you have so many copper pairs in a cable together, it acts a little like a capacitor and the frequencies can interact - causing an error rate on the line. In ADSL the modulation scheme will change resulting in a lower sync bandwidth. To allow operators to get the most out of the copper network - as this is what is mainly in the ground at the moment - crosstalk can be minimised to increase the available bandwidth per user on the cable. When you look at the standards of DSL its nearly always a combination of modulation and carriers as well as cross talk reduction that will maximise the bandwidth available. Cross talk to the point of GBs over another persons line would be pretty unrealistic, if there was that much data I think the whole line would have resync'd and barely been usable - I think you should check ALL devices on the network to see where the usage has come from. If you have a mobile phone, updates and new services (cloud back up etc) could have contributed to the higher usage.