It looked all so nice

I was really excited after my friend introduced me the alfred system. Bought about 10 Samsung phones in garage sales and put 6 to use. Plus one iPhone.

Unfortunately the Samsung phones suck all together. They will go for 1-3 days and then shut down. Every one of them.
The only iPhone I used works but who has 7 iPhones…
Nobody can explain how to keep the Samsungs working. They will go offline, have sign in problems with no reason and whatnot… They will ALWAYS go out. All of them.
Buying cheap Apples in garage sales is almost impossible because if they are old, nobody knows their passwords anymore and they are completely useless without.
Samsung would be the only working solution but… NO.