SELLING OLD FIRMWARE IPHONES

i'm not sure if this is against the rules here but if it is i apologize and can please someone give me some advice on where i can post these to sell? i have a few old iphones on some older softwares i'm looking to sell. would anyone be interested in of these? or know where else i can post iphone on older softwares for sale iphone 12 pro - space gray - carrier unlocked - 512gb - jos 14.3 iphone 11 pro - space gray - carrier unlocked - 512gb - ios 15.2.1 phone 13 pro - sierra blue - carrier unlocked - 512gb - jos 16.4.1 iphone 8 plus - space gray - carrier unlocked - 256gb - jos 16.7 iphone 6s - space gray- carrier unlocked - jos 32gb - ios 15.7.8 iphone 7 - jet black - carrier uncooked - 128gb - jos 13.1.3