More than one isp
Can you have more than one isp provider installed on your computer, obviously you would only be running one at a time and if so could they in any way conflict with each other and cause problems?
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1st to do it just get multiple ISP providers, they provide you with the accounts and then whatever account you use is which ISP you'll be using at the time. But ultimately it'll be going through your primary phone company that's creating the physical 1st point contact and that never really changes as they are the ones that own the lines.
It's typically point less though. Usually if you have poor connectivity it's because your last mile (the line going to your house) is bad so regardless of who your ISP is that can't be fixed. If you need service you contact your ISP provider and they in turn contact the phone company that provides the line.
Redundancy. Again no real redundcancy here unless it's your actual ISP that's going down a lot, in which case you should be changing ISP's and not dealing with redundant ones.
Why companies may deal with multiple ISP's is because they have redundant connections ie. Multiple ways the internet is getting into their building, either multiple phone lines, T1 connections, Fiber trunks etc or combinations of both, even better if the company happens to be physically located on more then 1 grid.
So yes you can, but no real point.