Iphone 4
I think that you are making a new device every 1 year idont know but why don't you make any update for iphone 4 iphone x ios11.2.5 iphone 4 ios7.1.2 so what you think about making iphone 4 more useable?
Vintage and obsolete products - https://support.apple.com/HT201624
Vintage and obsolete products - https://support.apple.com/HT201624
Iphone 4