ISP recognition

[KuJoe]

9 minutes ago, Vally said:

Okay I kinda get how it works, but for example in my case, when I changed modem and started to set it up, I automatically connected to my ISP without even mentioning that I changed. What I understand from that is that my telephone line is attached to my account and not the serial number and mac address of my modem. So basically, in the future if I change ISP, then the previous one will delete my record and the new one will add it to my account and add bandwith to this line and not to my modem.

If you change ISPs and you have broadband internet then the wires connecting your house to the internet will be changed (and most likely so will your modem). In most cases when you change ISPs there will be a hardware change telling your home network what ISP you're using, a software change will also occur as a result but you have no control over either.

[geo3]

3 hours ago, Vally said:

when I changed modem and started to set it up, I automatically connected to my ISP without even mentioning that I changed

What kind of modem was it and where did you get it?

[Vally]

3 minutes ago, geo3 said:

What kind of modem was it and where did you get it?

I changed to this modem, after the first one from my ISP was a total crap.

[Donut417]

3 hours ago, Vally said:

when I changed modem and started to set it up, I automatically connected to my ISP without even mentioning that I changed.

You dont necessarily have to call. Comcast has made it automated. Where you connect a new modem and it kicks you to the walled garden where you put your Comcast user name and password in to authenticate. However they still get the info they need from that process. 

[geo3]

37 minutes ago, Vally said:

I changed to this modem, after the first one from my ISP was a total crap.

Are you using the blue ADSL port on the back?

[Vally]

3 hours ago, geo3 said:

Are you using the blue ADSL port on the back?

Yes, which goes to the splitter and then to the telephone line in the wall.

[geo3]

1 hour ago, Vally said:

Yes, which goes to the splitter and then to the telephone line in the wall.

So I'm guessing that physical line is specifically provisioned for your account. There is probably a fiber-to-copper box on the pole or the side of your house where that line comes from that is specific to your account. Or it could be a multi port deal that serves your block and one port is assigned to you. 

 

Either way this box is owned by your ISP and is physically part of their network. Changing your own IP, (even if that could work), would not put you on another ISPs network. You would have to physically switch wires around at the very least to achieve this.