"2) If I can change my IP address, regardless of which ISP I use, can I make it always appear the same, so that no matter what ISP I use, it always looks like I'm using the same IP address?" At the very least, you need to be on the same subnet as your ISP's gateway, or you won't be getting out to the web.
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May 08, 2020
The IP address for a wireless connection is called Wireless Network Connection or Wireless. Left-click Internet Protocol Version (TCP/IPv4) and click Properties. Select the Use the following IP address option. Enter your desired IP address and click in the Subnet Mask area, which should auto-complete. Click OK twice to apply the settings.
How to Change IP Address on Android - TechBeasts
How to Change Your IP Address (with Pictures) - wikiHow Changing Your IP Address on Windows: Disable your internet connection. Are you ready to get your … How to change the IP address of an Android phone or device May 08, 2020