I have currently a D-Link DSL-300T ADSL Modem. This works fine on my 1Mb broadband, but I am changing in November to an 8Mb service. The master socket is connected to the modem, which is two floors up in my house, by some mult-core signal cable I was given. There must be a good chance this will not work very well at the higher speed.
To re-lay better cable is not an option, so I presume going wireless may be a good option.
If, and as I do not know how it will work, I say only if I need to change to wireless. What will I need? Please use simple terms, I have not looked at wireless before!!!