Obviously wrote
Yes I believe the building we live in is around 40-50 years old.
I live right next to the Badaro central.
1- Where do I purchase these cables from? Would the electrician get these cables if I asked him for them?
2- What is twisting?
3- cat3 or cat6e? or doesn't matter?
4- What is the RJ11 side?
The following is the twisted pair:
And this is the RJ 11
Cat 6 comes with 4 pairs of twisted pair and you only need one pair of those. Cat 3 comes with different amount of pairs you can find 1 pair up to 2400 pairs. usually for homes they use 2 pairs cat3 cable.
You can purchase these cables from any network shop or any electronics shops. The brands are: 3M, Schneider Electric, Belden, panduit, etc. Also Liban cables have such cables. Any good quality cable would solve this issue.
As you can see in the following image, old phone cables are not twisted which causes noise for DSL frequencies.