Need expert phone programmers advice?

I don't much about phone security, but I know that they say iPhones have greater security over Androids, however Androids have an easy way to completely wipe the phone unlike iPhone. With iPhone there are apps to see screen time from whichever phone and iPhone isn't immune so where is the security? No alerts?

How to unlock an icloud activation lock?

I bought an iPhone 8 Plus off of someone on Craigslist and it turns out the device is icloud locked. I spent a lot of money on this phone already so I would like an inexpensive, free way to unlock.

Best actual, USB iPhone app?

I don't trust the Internet to download large files when transferring files via iCloud or whatever. So, I bought a 4 way 64 go usb. It works just great and all, I just can't get to work an iPhone because the apps I'm using suck. Anyone know a really good USB to iPhone app?

How would i go about switching my iphone xr to the iphone se?

I have tiny hands and hate having such a big phone it's like a tablet for me. I love the se but apple discontinued it. I found a seller on ebay selling them in excellent condition. I have my xr through t-mobile so how would i switch? Do i just slip the sim card into it or? And would the bill be lowered because it's an older phone? I don't know about these things, ty ty

How can I increase my iPhone's storage space?

And good morning. In regards to the topic above, does anyone know how I can increase my iPhone's storage space? What I'm looking for, specifically, is a means of transferring [video game] app data, externally, while I continue using the app.

In essence, I would ideally be streaming data between a gaming app and an external storage device.

Kind regards,
Otaku

P.S. I've heard and seen an iPhone flash drive in action. But I'm unsure of whether or not it can simultaneously "steam" data between the gaming apps and the flash drive.

If they are cable of such, does anyone have any recommendations?